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3 Best Prepaid SIM Cards in Guam & the CNMI: Buying Guide

Guam – an unincorporated territory of the United States in the Pacific Ocean. It is closer to Southeast and East Asia and Oceania than mainland United States.

Known for its stunning beaches, crystal clear ocean water, and terrific resorts.

The Northern Mariana Islands – the Commonwealth of the Northern Mariana Islands (CNMI) is another unincorporated territory of the United States.

Known for its famous islands like Saipan, Tinian, and Rota.

Each island has its unique traits. Bord Island on Saipan. The prehistoric ruins in Tinian. And the relaxed atmosphere in Rota.

In general, there should be no reason to be bored when in Guam & the Northern Mariana Islands. There is a lot to do.

Do note that if you plan on sharing your experiences online, you may go back home and have to deal with an expensive roaming bill. Roaming can be expensive and should be avoided whenever you can. At least, that is if you like money.

Especially if you have a SIM card from mainland USA because the big three (AT&T, T-Mobile & Verizon) do not operate in Guam or the Northern Mariana Islands – you will be roaming instead.

Luckily, you can get local SIM cards, allowing you to enjoy local rates – much cheaper than international roaming.

You can get a SIM card for 20 USD in Guam and the Northern Mariana Islands by visiting the stores of DoCoMo Pacific, IT&E & GTA (Teleguam). 7 GB valid for 7 days will cost you at least 15 USD.

Cannot see the video above? Watch it here or on YouTube.

These prices may seem high, but roaming bills can be much higher!

And getting a local SIM card is truly worth it – for real!

In this guide, I will go over everything you need to know about buying a SIM card in Guam & the Northern Mariana Islands. Let's do this.

Buying a SIM Card in Guam & the Northern Mariana Islands (CNMI) Guide (logos of DoCoMo Pacific, GTA Teleguam & IT&E)

Original publication: 30th of January 2020. Last updated: 23rd of July 2021.

Table of Contents

In This Guide Show

Can You Buy a SIM Card in Guam & the Northern Mariana Islands?

Anyone is allowed to buy a SIM card in Guam & the Northern Mariana Islands, including tourists and visitors.

Be aware that you need a phone that supports the frequencies used in the country (preferably all of them to have the most optimal experience while in Guam & the Northern Mariana Islands).

Where Can You Buy a SIM Card in Guam & the Northern Mariana Islands?

You can get a SIM card in the official stores of DoCoMo Pacific, IT&E (+iConnect) & GTA (Teleguam) and authorized resellers, including kiosks, grocery stores, and gas stations.

It is also possible to get SIM cards at Guam Antonia B. Won Pat Airport (Guam International Airport) & Saipan International Airport (Fransisco C. Ada Airport).

Cannot see the video above? Watch it here or on YouTube.

You can expect to pay the following for Guamanian SIM cards:

  • DoCoMo Pacific: 19.95 USD
  • IT&E (+iConnect): 19.95 USD
  • GTA (Teleguam): 20 USD

The following operators also have SIM cards targeting tourists:

  • DoCoMo Pacific: 25 USD
  • IT&E (+iConnect): 20 USD & 30 USD

Can You Use Your Phone in Guam & the Northern Mariana Islands?

Guam & the Northern Mariana Islands use GSM and CDMA technology for mobile telecommunications services. However, CDMA is fading away quickly.

Fortunately, there is a 99% chance you have a phone that supports GSM.

Guam & the Northern Mariana Islands use traditional American frequencies, which are mainly used in the Americas (North-, Central– & South America + the Caribbean – ITU Region 2).

Although the Northern Mariana Islands are officially part of Oceania, they are unincorporated territory of the United States, which is one of the various reasons why they use American frequencies over European frequencies, unlike other places in Oceania.

Other parts of the world (Africa, Asia (including the Middle East), Europe, and Oceania – ITU Regions 1 & 3) use European frequencies, which are different from the American frequencies.

ITU Regions Map
By Maximilian Dörrbecker (Chumwa) – Own work, using this file by Denelson83, CC BY-SA 2.5

If you purchased your phone in the Americas (ITU Region 2), you should not experience any issues with using your phone in Guam & the Northern Mariana Islands.

If you bought your phone in Africa, Asia, Europe, or Oceania (ITU regions 1 & 3) and have a low/medium-end device without Tri-Band or Quad-Band support, then there is a possibility you cannot use your phone when in Guam & the Northern Mariana Islands or can only use slower networks (3G or 2G).

If you have a medium/high-end device with Tri-Band or Quad-Band support, you can use your phone in Guam & the Northern Mariana Islands (to some extent) – also on 4G/LTE.

Mobile Operators, Networks & Frequencies in Guam & the Northern Mariana Islands

Guam & the Northern Mariana Islands have three mobile network operators:

  • DoCoMo Pacific
  • IT&E (+iConnect)
  • GTA (Teleguam – Guam only)

Note: iConnect (Advanced) got acquired by IT&E.

The following frequencies are used in Guam & the Northern Mariana Islands:

  • 2G: 850 MHz &1900 MHz
  • 3G: 850 MHz & 1900 MHz
  • 4G/LTE: 700 MHz (Band 12 & Band 17), 1700 MHz (Band 4) & 1900 MHz (Band 2)
  • 5G NR: Unknown

You can learn more about frequencies in the video below.

Cannot see the video above? Watch it here or on YouTube.

To check whether your phone will work in Guam & Northern Mariana Islands, check out this page by Will My Phone Work (may be outdated or inaccurate at times).

Again, make sure your phone is unlocked. Otherwise, you will not be able to use any SIM card except the one from your home operator (meaning you have to roam internationally or buy another unlocked phone that does support the frequencies listed above).

If you want to learn how international roaming works, this guide explains it in-depth. If you wonder why it is often so expensive to roam, this article explains the hidden reason they do not want you to know.

5G NR in Guam & the Northern Mariana Islands

Commercial 5G NR has been available in Guam since late 2019, with DoCoMo Pacific launching the new service. In 2020, 5G NR was also launched in the Northern Mariana Islands (Saipan). However, 5G NR is currently only available to postpaid customers/subscribers.

It is unknown when IT&E (+iConnect) and GTA (Teleguam) will offer 5G NR services, but the Federal Communications Commission (FFC) has been holding 5G license auctions in the US overseas territories since 2020.

Then the question will be whether prepaid customers can also take advantage of 5G NR upon launch or not.

Best SIM Card in Guam & the Northern Mariana Islands

If you want to buy the best SIM card in Guam & the Northern Mariana Islands, I recommend going with DoCoMo Pacific or GTA. DoCoMo Pacific is regarded as the best overall by the locals. GTA won the Best Mobile Coverage award twice in 2019.

SIM Card Registration in Guam & the Northern Mariana Islands

SIM card registration, with the use of your personal information (such as your passport), is not required when buying a SIM card in Guam & the Northern Mariana Islands.

Guam & the Northern Mariana Islands Mobile Internet Prices & Insights

Flag of Guam
Flag of Northern Mariana Islands

Mobile data in Oceania used to be crazy expensive. That was because many pacific nations were reliant on satellite connections for broadband and wireless internet.

However, satellites used to be expensive and slow, which were reflected in the prices. Luckily, many pacific nations have been linked to submarine cables. Those cables offer much faster speeds and provide internet at lower costs than satellites.

Guam and the Northern Mariana Islands were somewhat lucky because they were always backed by the United States regarding submarine cables. As a result, the cost of mobile data was not too expensive for regional standards – some would even say it was cheap.

But how much does data cost in Guam and the Northern Mariana Islands?

The average price for 1 GB of data in Guam is 2.14 USD and 2.15 in the Northern Mariana Islands, far below the Oceanian average of 5.51 USD. The world average is 4.07 USD.

You may be wondering why the prices are different in Guam and the Northern Marian Islands. The mobile operators used to charge (slightly) more for the same plans in the Northern Mariana Islands than Guam in the past.

This is slowly reversing where plans in Guam are (slightly) more expensive than in the Northern Mariana Islands.

The telecom market is rather competitive in Guam and the Northern Mariana Islands. There are pacific nations with a higher population with only one mobile operator (driving up the prices).

Guam and the Northern Mariana Islands used to have four mobile operators. iConnect got acquired by IT&E, so the number of players went down to three.

Even then, speeds are quite decent, and mobile coverage is rather extensive. As a result, you should have a smooth network experience in Guam & the Northern Mariana Islands.

Currency in Guam & the Northern Mariana Islands

10 US Dollar Note
© U.S. Currency Education Program

Guam & the Northern Mariana Islands use the US Dollar with the symbol USD (which will be used throughout this article). Prices in Guam & Northern Mariana Islands are listed in just $.

If your credit/debit card charges you foreign exchange fees, get yourself a Wise Borderless Account and Debit Card. Their fees are MUCH lower than banks, and credit card companies charge you (and Wise is transparent about their fees, unlike banks). I have saved literal THOUSANDS of Euros, my main currency, when using Wise abroad when traveling compared to my debit and credit cards. Open a Wise account FREE!

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Guam & Northern Mariana Islands Prepaid SIM Cards (Videos)

Below, I will guide you through DoCoMo Pacific, IT&E (+iConnect) & GTA (Teleguam), and go through:

  • Background information
  • Mobile coverage
  • SIM card types, prices, and availability
  • Recharge/top-up information
  • Combo plans, data plans, and special packs (such as social media packs) 

Prefer to watch videos instead? Watch this complete Guam & Northern Mariana Islands SIM card buying guide.

Cannot see the video above? Watch it here or on YouTube.

You can also watch all the videos related to Guam & Northern Mariana Islands SIM cards in the playlist below.

Cannot see the playlist above? Check it on YouTube.

With that being said, let’s see what Guam & the Northern Mariana Islands have to offer to us.

DoCoMo Pacific

DoCoMo Pacific Logo
© DoCoMo Pacific

DoCoMo Pacific is one of the largest mobile operators in Guam & the Northern Mariana Islands. It was the first mobile operator to offer 5G NR in both territories.

DoCoMo Pacific uses the following frequencies:

  • 2G: 1900 MHz
  • 3G: 850 MHz
  • 4G/LTE: 700 MHz (Band 17)
  • 5G NR: Unknown

This is what you will learn about DoCoMo Pacific:

* Coverage
* How to Get a DoCoMo Pacific SIM Card & SIM Card Price
* Topping Up Options & Methods + Balance Check
* Plans & Packages
* APN/Internet Settings

Click on the links above to jump to the section you are interested in.

Jump to: IT&E | GTA

Coverage – DoCoMo Pacific

DoCoMo Pacific has extensive coverage in Guam & the Northern Mariana Islands.

It may have the best coverage. But it is probably a tie with GTA (Teleguam).

DoCoMo Pacific has several coverage maps showing off its reception in Guam, Rota, Saipan & Tinian.

Below is DoCoMo Pacific's coverage maps of Guam:

Here are the maps of Rota:

Then we have the maps of Saipan:

Finally, we have the maps of Tinian:

I always like to compare the official coverage maps with independently made maps because operators like to be overly optimistic.

DoCoMo Pacific Guam Coverage Map
Guam | Source
DoCoMo Pacific Rota Coverage Map
Rota | Source
DoCoMo Pacific Northern Mariana Islands Coverage Map
CNMI | Source
DoCoMo Pacific Guam & Northern Mariana Islands Coverage Map
Both territories | Source

SIM Card Price – DoCoMo Pacific

You can get a DoCoMo Pacific SIM Card for 19.95 USD with 10 USD in credit in DoCoMo Pacific stores. It is also possible to buy SIM cards at Guam Antonia B. Won Pat International Airport & Saipan Francisco C. Ada International Airport.

Short-term travelers can also take advantage of the Visitor SIM card. It costs 25 USD and features 7 GB of data, unlimited local minutes, unlimited local SMS, and 15 international minutes to China, Japan, Russia, South Korea, Taiwan & the United States – all valid for 7 days.

DoCoMo Pacific Visitor SIM Card
© DoCoMo Pacific

You have to text 7 to 8687 to activate your Visitor SIM.

Top-Up, Recharge & Balance Check – DoCoMo Pacific

DoCoMo Pacific top-up vouchers, in values between 5 USD to 20 USD, are sold in DoCoMo Pacific stores and other stores, including kiosks, phone stores, and grocery stores.

The following top-up options are available:

  • 5 USD
  • 10 USD
  • 20 USD

To top up your DoCoMo Pacific SIM card, dial *111*VoucherCode#.

For example, if your voucher code is 123456, you would dial *111*123456#.

You can also recharge online with (international) debit and credit cards.

Dial *112# to check your DoCoMo Pacific balance.

Packages, Plans, Bundles & Offers – DoCoMo Pacific

DoCoMo Pacific has two data-featured plans: Endless Flex (combo) & Multi-Day Flex Plans (combo).

Endless Flex – DoCoMo Pacific

The Endless Flex plans are daily combo bundles with data, minutes, and SMS.

Be aware of the price difference of 0.25 USD when activating the plan in the Northern Mariana Islands (2.25 USD) and Guam (2.50 USD).

You can activate Endless Flex by texting the Activation Code to 3282:

PricePlanDataLocal Minutes 1Local SMS 1ValidityActivation Code
2.25 USD1 Day (CNMI)UnlimitedUnlimitedUnlimited1 dayHS1
2.50 USD1 Day (Guam)UnlimitedUnlimitedUnlimited1 dayHS1

1 also to the United States

Endless Flex plans auto-renew.

Multi-Day Flex Plans – DoCoMo Pacific
DoCoMo Pacific Prepaid Flex
© DoCoMo Pacific

The Multi-Day Flex Plans are combo bundles with data, unlimited data with Social Pass (Facebook, Facebook Messenger, Instagram, Line, Skype, Snapchat, Twitter, WeChat & WhatsApp), minutes, and SMS.

DoCoMo Pacific Social Pass Apps
© DoCoMo Pacific

Be aware of the price difference of 1 USD when activating Flex 3 in the Northern Mariana Islands (6.50 USD) and Guam (7.50 USD).

You can activate Multi-Day Flex Plans by texting the Activation Code to 3282:

PricePlanData 1Local MinutesLocal SMSValidityActivation Code
6.50 USDFlex 3 (CNMI)3 GBUnlimitedUnlimited3 daysHS3
7.50 USDFlex 3 (Guam)3 GBUnlimitedUnlimited3 daysHS3
15 USDFlex 77 GBUnlimitedUnlimited7 daysHS7
30 USDFlex 1414 GBUnlimitedUnlimited15 daysHS14

You can still browse the web when you have exhausted your data allowance. However, your speeds will be throttled to 256 Kbps.

Multi-Day Flex Plans auto-renew.

APN/Internet Settings – DoCoMo Pacific

  • Name: docomo
  • APN: internet
  • APN type: default OR internet

Note: leave anything not mentioned above untouched.

Jump back to the Table of Contents.

IT&E (+iConnect)

IT&E Logo
© IT&E

IT&E is as big as DoCoMo Pacific or is the largest mobile operator in Guam & the Northern Mariana Islands after IT&E acquired iConnect (Advanced).

iConnect Guam Logo
© iConnect

IT&E uses the following frequencies:

  • 2G: 850 MHz & 1900 MHz
  • 3G: 850 MHz & 1900 MHz
  • 4G/LTE: 700 MHz (Band 12), 1700 MHz (Band 4) & 1900 MHz (Band 2)

This is what you will learn about IT&E:

* Coverage
* How to Get an IT&E SIM Card & SIM Card Price
* Topping Up Options & Methods + Balance Check
* Plans & Packages
* APN/Internet Settings

Click on the links above to jump to the section you are interested in.

Jump to: DoCoMo Pacific | GTA

Coverage – IT&E (+iConnect)

IT&E has extensive coverage in Guam & the Northern Mariana Islands.

Below are IT&E's coverage maps:

IT&E Guam Coverage Map
Guam | Source
IT&E Rota Coverage Map
Rota | Source
IT&E Northern Mariana Islands Coverage Map
CNMI | Source
IT&E Guam & the Northern Mariana Islands Coverage Map
Both territories | Source

SIM Card Price – IT&E (+iConnect)

You can get an IT&E SIM Card for 19.95 USD with 10 USD in credit in IT&E stores.

Dial *670# to activate your IT&E SIM card if your phone number starts 670 (bought in the Northern Mariana Islands) and *671# if the phone number starts with 671 (bought in Guam).

Short-term travelers can also take advantage of the Hafa Adai SIM cards – IT&E's tourist SIM cards. They include unlimited data, unlimited local minutes, 10 USD international call credit, and unlimited local SMS – valid for up to 7 days.

IT&E Hafa Adai SIM Card
© IT&E

The following two Hafa Adai SIM cards are available:

PriceDataLocal MinutesInternational Minutes CreditLocal SMSValidity
20 USDUnlimitedUnlimited10 USDUnlimited4 days
30 USDUnlimitedUnlimited10 USDUnlimited7 days

Besides getting Hafa Adai SIM cards at IT&E stores, you can also grab them at Shell gas stations, 76 gas stations, Andersen Airforce Exchange Services (AAFES), Bon Voyage stores (Guam), and various gift shops, resorts, and supermarkets in Saipan.

Do note that Hafa Adai SIM cards cannot be extended.

Top-Up, Recharge & Balance Check – IT&E (+iConnect)

IT&E top-up vouchers, in values between 5 USD to 20 USD, are sold in IT&E stores and other stores, including kiosks, phone stores, and grocery stores.

The following top-up options are available:

  • 5 USD
  • 10 USD
  • 20 USD
IT&E Top Up Cards
© IT&E

To top up your IT&E SIM card, text LOAD VoucherCode to 2931.

For example, if your voucher code is 123456, you would text LOAD 123456 to 2931.

You can also recharge online with (international) debit and credit cards.

Dial *87 to check your IT&E balance.

Packages, Plans, Bundles & Offers – IT&E (+iConnect)

IT&E Plans
© IT&E

IT&E has the Prepaid Power Plans, which are combo bundles with data, minutes, and SMS.

The following Prepaid Power Plans are available:

PricePlanDataLocal MinutesLocal SMSValidityActivation Code
1.50 USD100 MB Plan100 MBUnlimitedUnlimited24 hours*289*101#
2 USD200 MB Plan200 MBUnlimited 1Unlimited24 hours*289*102#
2.50 USDUnlimited Data PlanUnlimitedUnlimited 1Unlimited24 hours*289*103#
15 USD7-Day Plan1 GB/day (7 GB)Unlimited 1Unlimited7 days*289*104#
60 USD30-Day Plan40 GBUnlimited 1Unlimited30 days*289*1082#

1 also to the United States

Prepaid Power Plans auto-renew. To disable auto-renewal, text CANCEL to 3282.

APN/Internet Settings – IT&E (+iConnect)

  • Name: ITE
  • APN: prepaid.ite.net

Note: leave anything not mentioned above untouched.

Jump back to the Table of Contents.

GTA (Teleguam)

GTA Teleguam Logo
© GTA

GTA (Teleguam) is the smallest operator in Guam. This is also in part due to GTA only being active in Guam.

GTA uses the following frequencies:

  • 2G: 850 MHz & 1900 MHz
  • 3G: 850 MHz & 1900 MHz
  • 4G/LTE: 700 MHz (Band 12) & 1700 MHz (Band 4)

This is what you will learn about GTA:

* Coverage
* How to Get a GTA SIM Card & SIM Card Price
* Topping Up Options & Methods + Balance Check
* Plans & Packages
* APN/Internet Settings

Click on the links above to jump to the section you are interested in.

Jump to: DoCoMo Pacific | IT&E

Coverage – GTA (Teleguam)

GTA has extensive coverage in Guam.

It even won the Guam Speedtest Awards Best Mobile Coverage twice in 2019 (Q1-Q2 & Q3-Q4).

Below is GTA's coverage map:

SIM Card Price – GTA (Teleguam)

You can get a GTA SIM Card for 20 USD with 10 USD in credit in GTA stores.

You have to dial *488# to activate your GTA SIM card.

GTA SIM cards get deactivated if there has been no activity for 90 days (no top-up for 90 days or no activity for 90 days).

Top-Up, Recharge & Balance Check – GTA (Teleguam)

GTA Pacific top-up vouchers are sold in GTA stores and other stores, including kiosks, phone stores, and grocery stores.

To top up your GTA SIM card, dial *488# and follow the instructions. The same can be done by dialing *55. You can use the same shortcodes for checking your GTA balance.

You can also recharge online with (international) debit and credit cards.

Packages, Plans, Bundles & Offers – GTA (Teleguam)

GTA has two data-featured plans: Prepaid Plans (combo) & Data Add-On Plans (data add-ons).

All GTA plans can be activated by dialing *488# and selecting option 3.

Prepaid Plans – GTA (Teleguam)

The Prepaid Plans are combo plans with data, minutes, and SMS.

The following Prepaid Plans are available, which can be activated by dialing *488# and selection option 1 or dialing *55:

PriceDataLocal MinutesLocal SMSValidity
2.50 USDUnlimitedUnlimitedUnlimited 11 day
25 USD500 MB250 minutesUnlimited30 days
35 USD500 MB500 minutesUnlimited30 days
45 USD5 GB500 minutesUnlimited30 days
60 USD1 GBUnlimitedUnlimited30 days
70 USD3 GBUnlimitedUnlimited30 days

1 also to the United States

Data Add-On Plans – GTA (Teleguam)

The Data Add-On Plans are data add-ons. They cannot be purchased as standalone plans.

The following Data Add-On Plans are available, which can be activated by dialing *488# and selection option 1 or dialing *55:

PricePlanValidity
3 USD1 GB30 days
5 USD3 GB30 days
10 USD5 GB30 days
15 USD10 GB30 days

APN/Internet Settings – GTA (Teleguam)

  • Name: GTA
  • APN: mpulse.gta.net

Note: leave anything not mentioned above untouched.

Jump back to the Table of Contents.

Other Ways to Stay Connected When Traveling in Guam & the Northern Mariana Islands

Getting a Guamanian SIM card is the best way to stay connected in the country. You have learned that SIM cards are cheap, plans are generous, and speeds are blazing fast.

But sometimes, getting a local SIM card is not possible. Perhaps you have a SIM-lock phone. The operator you prefer to go with does not support the frequencies your phone uses, or you cannot be bothered to deal with SIM card registration in every country you are visiting.

Luckily, there are other ways to get online when in Guam & the Northern Mariana Islands.

However, these methods may be more expensive than getting a SIM card from the local operators.

International Roaming

International roaming is the most convenient way to stay connected when traveling in other countries because you do not have to buy a new SIM card, have to deal with SIM card registration regulations, nor have multiple phone numbers to deal with.

However, international roaming has proven to be expensive in many cases, especially compared to buying local SIM cards. That is why many travelers are not fond of international roaming.

International roaming has its pros and cons. However, it is important to know how it works. This in-depth guide explains it all.

Find out whether your mobile operator has attractive roaming rates for Guam & the Northern Mariana Islands here.

Using an International SIM Card or Travel SIM Card

International SIM cards are SIM cards made for the traveler in mind. Using them is often cheaper than international roaming. However, they are almost always more expensive than using a local SIM card.

There are many other advantages and disadvantages of getting international SIM cards, which you can learn about here.

Using a Mobile Hotspot (Pocket WIFI)

Mobile hotspots, or pocket WIFI, are small devices that connect to the local operators of the country you are visiting. Mobile hotspots are ideal for families or those traveling in a large group, as they allow you to connect multiple devices to one hotspot without the need of each traveler having to buy a SIM card.

You can either buy a mobile hotspot or rent one.

The Preferred Way to Stay Connected When Traveling in Guam & the Northern Mariana Islands

Getting a SIM card from DoCoMo Pacific would do you well when considering a Guamanian & the Northern Mariana Islands card.

Local Prepaid SIM Cards in Other Oceanian Countries

Visiting other countries in Oceania? Check out my Oceania SIM card buying guide, covering other Oceanian nations, such as:

Going to other places around the world? Then you should also check out my sim card buying guides for other destinations around the world.

Next Steps to Enhance Your Travel Experiences

Looking for the next steps to enhance your phone travel experiences? Here is what to do:

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Learn About Your Phone Travel Options

You can buy local prepaid SIM cards, international SIM cards, mobile hotspots, or roam internationally.

Each of these options has its pros and cons. Learn more about them, and find the best option for you.

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