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Best Deal: Mint Mobile 4GB SIM for $15/mo

Best GSM SIM Card

How much is a GSM SIM card?

99% coverage4G & 5G speedBring your phoneNo contracts
Big wireless coverage at small prices: switch & save up to $600 a year
Reach Mobile Sim Card - Vertical
2GB4G/5G Data
$10*per month
Powered by:
See Deal* $10 Off First 3 Months
Mint Mobile Sim Card - Vertical
4GB4G/5G Data
$15*per month
Powered by:
See Deal* Buy 3 Months Get 1 Free
US Mobile Sim Card - Vertical
12GB4G/5G Data
$20per month
Powered by:
See DealFree Starter Kit with code: MSPUSM
Mint Mobile Sim Card - Vertical
Unltd4G/5G Data
$30*per month
Powered by:
See Deal* Buy 3 Months Get 1 Free
Tello Sim Card - Vertical
1GB4G/5G Data
$10per month
Powered by:
Boost Mobile Sim Card - Vertical
2GB4G/5G Data
$15per month
Powered by:
Mint Mobile Sim Card - Vertical
10GB4G/5G Data
$20*per month
Powered by:
See Deal* Buy 3 Months Get 1 Free
US Mobile Sim Card - Vertical
18GB4G/5G Data
$25per month
Powered by:
See DealFree Starter Kit with code: MSPUSM
Reach Mobile Sim Card - Vertical
25GB4G/5G Data
$35*per month
Powered by:
See Deal* $10 Off First 3 Months
Boost Mobile Sim Card - Vertical
5GB4G/5G Data
$25*per month
Powered by:
See Deal* $0.99 for 1st Month
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Disclaimer: MoneySavingPro is a free price comparison service but we do not provide service directly. We do our best to keep all the information up to date but there may be some discrepancies between the price you pay.

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VerizonVerizon 4G & 5GUnlimited*$80/mo$960/yr
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Cheapest GSM SIM card in 2022

By Rob Webber - Last updated on

Looking for a SIM card for your GSM phone? You've come to the right place.

GSM (Global System for Mobiles) is one of the technologies used worldwide for cell phones and is used by AT&T and T-Mobile.

There's a range of low cost carriers, also known as MVNOs, that can save you money on your GSM SIM card. Powered by AT&T and T-Mobile networks, you'll receive the same quality coverage at half the price.

Take a look below for a break down of carriers and plans available, to find the best GSM SIM card deal for you.

Prepaid GSM SIMTello
Unlimited GSM SIMMint Mobile
Family GSM SIMPureTalk
Senior GSM SIMGood2Go Mobile
Kids GSM SIMRed Pocket
Best data SIMUS Mobile
Check Carrier Coverage

Cheap GSM SIM cards

Best prepaid GSM SIM card

Tello SIM Card - Tello 1GB SIM kitTello SIM Card - Tello 1GB SIM kit
Minutes
Unlimited
Texts
Unlimited
Data
1GB
Price
$10
Powered by:

This Tello SIM kit includes unlimited mins, unlimited texts and 1GB data for $10 for 1 month of wireless service. Tello plans offer wireless coverage on the T-Mobile 5G and 4G LTE network. To learn more about why this is one of the best cell phone plans, check out MoneySavingPro's Tello review

Review
5

Pros

  • 24/7 customer support

  • No contracts

  • Budget friendly family plans

Cons

  • No roaming

  • Coverage in rural areas

Benefits

  • Service on the nationwide T-Mobile network

  • Money-back guarantee on phones (no refunds on plans)

  • Prepaid - no contract, credit check, or activation fee

  • Bring your own phone or choose from a modest selection of new or refurbished devices

  • Keep your current phone number

  • Use of your plan data as a mobile hotspot through your phone is allowed

  • Use your minutes to call Canada, China, and Mexico

  • Minutes to other countries available as add-on

  • 24/7 customer service

Best GSM SIM card for unlimited data

Mint Mobile SIM Card - Mint Mobile unlimited data SIM kitMint Mobile SIM Card - Mint Mobile unlimited data SIM kit
Minutes
Unlimited
Texts
Unlimited
Data
Unlimited
Price
$90** Buy 3 Months Get 1 Free
Powered by:

This Mint Mobile SIM kit includes unlimited mins, unlimited texts and unlimited data for $90 for 3 months of wireless service. Mint Mobile plans offer wireless coverage on the T-Mobile 5G and 4G LTE network. To learn more about why this is one of the best cell phone plans, check out MoneySavingPro's Mint Mobile review

Plans
PlanDataPriceView plan

Mint Mobile 4GB SIM card

4GB

$15*

* Buy 3 Months Get 1 Free
View Plan

Mint Mobile 10GB SIM card

10GB

$20*

* Buy 3 Months Get 1 Free
View Plan

Mint Mobile 15GB SIM card

15GB

$25*

* Buy 3 Months Get 1 Free
View Plan

Mint Mobile Unlimited SIM card

Unlimited

$30*

* Buy 3 Months Get 1 Free
View Plan
Review
4.5

Pros

  • Offers the latest phones with 0% finance

  • Prepay months in bulk for more savings

  • Reliable network coverage

  • Works with most GSM phones

Cons

  • No family plans

  • Minimum 3 months

Benefits

  • Operates on the nationwide T-Mobile network

  • 7-day money-back guarantee

  • Prepaid - no contract, credit check, or activation fee

  • Bring your phone or buy a Mint Mobile device

  • Keep your phone number

  • Using your phone as a mobile hotspot is permitted

  • Free calling to Canada & Mexico, affordable rates to 160+ other locations

  • Flat-rate international roaming available as an add-on feature

  • Customer service by phone on weekdays and weekends, 24/7 by virtual chat

Best GSM SIM card for families

PureTalk SIM Card - PureTalk 4GB SIM kitPureTalk SIM Card - PureTalk 4GB SIM kit
Minutes
Unlimited
Texts
Unlimited
Data
4GB
Price
$18.75** 25% Off for 3 Months
Powered by:

This PureTalk SIM kit includes unlimited mins, unlimited texts and 4GB data for $18.75 for 1 month of wireless service. PureTalk plans offer wireless coverage on the AT&T 5G and 4G LTE network. To learn more about why this is one of the best cell phone plans, check out MoneySavingPro's PureTalk review

Plans
PlanDataPriceView plan

PureTalk 2GB SIM card

2GB

$15*

* 25% Off for 3 Months
View Plan

PureTalk 4GB SIM card

4GB

$18.75*

* 25% Off for 3 Months
View Plan

PureTalk 6GB SIM card

6GB

$22.50*

* 25% Off for 3 Months
View Plan

PureTalk 10GB SIM card

10GB

$26.50*

* 25% Off for 3 Months
View Plan

PureTalk 20GB SIM card

20GB

$33.75*

* 25% Off for 3 Months
View Plan

PureTalk Unlimited SIM card

Unlimited

$41.25*

* 25% Off for 3 Months
View Plan
Review
3.5

Pros

  • 4G LTE coverage

  • Multi-month discounts

  • US based customer service

Cons

  • No 0% finance plans for new phones

  • May slow speeds at busy times

Benefits

  • Service provided on the AT&T network

  • Prepaid service - no contract, credit check, or activation fee

  • 30-day risk-free guarantee on plans- cancel within your first 30 days or 500 minutes/500 MB of data to receive a refund for your plan charges

  • Bring your own compatible GSM phone or buy a PureTalk USA phone

  • Keep your phone number

  • Mobile hotspot/tethering permitted

  • International calling available as an add-on calling card

  • Customer support available by phone 9am - 10pm EST weekdays and 12pm - 9pm weekends

Best GSM SIM card for seniors

Good2Go Mobile SIM Card - Good2Go Mobile 1GB SIM kitGood2Go Mobile SIM Card - Good2Go Mobile 1GB SIM kit
Minutes
Unlimited
Texts
Unlimited
Data
1GB
Price
$10** 50% Off for 3 Months
Powered by:

This Good2Go Mobile SIM kit includes unlimited mins, unlimited texts and 1GB data for $10 for 1 month of wireless service. Good2Go Mobile plans offer wireless coverage on the AT&T & T-Mobile 5G and 4G LTE networks. To learn more about why this is one of the best cell phone plans, check out MoneySavingPro's Good2Go Mobile review

Plans
PlanDataPriceView plan

Good2Go Mobile 1GB SIM card

1GB

$10*

* 50% Off for 3 Months
View Plan

Good2Go Mobile 0GB SIM card

0GB

$10

View Plan

Good2Go Mobile 3GB SIM card

3GB

$12.50*

* 50% Off for 3 Months
View Plan

Good2Go Mobile 6GB SIM card

6GB

$17.50*

* 50% Off for 3 Months
View Plan

Good2Go Mobile 10GB SIM card

10GB

$40

View Plan

Good2Go Mobile 20GB SIM card

20GB

$50

View Plan
Review
4

Pros

  • 4G LTE coverage

  • No contract

  • No credit checks

Cons

  • No unlimited data options

  • No app interface

Benefits

  • Coverage on the nationwide AT&T & T-Mobile networks

  • Prepaid cell phone plans - no contract, credit check, or activation fee

  • Bring your own phone or buy a Good2Go Mobile phone

  • Mobile hotspot/tethering not supported

  • International calling to over 60 countries available as affordable plan add-on; calling to other countries via add-on calling card

  • Customer service available by phone 7am - 1am EST every day

Best GSM SIM card for kids

Red Pocket SIM Card - Red Pocket 500MB SIM kitRed Pocket SIM Card - Red Pocket 500MB SIM kit
Minutes
500
Texts
500
Data
500MB
Price
$10
Powered by:

This Red Pocket SIM kit includes 500 mins, 500 texts and 500MB data for $10 for 1 month of wireless service. Red Pocket plans offer wireless coverage on the AT&T, Verizon & T-Mobile 5G and 4G LTE networks. To learn more about why this is one of the best cell phone plans, check out MoneySavingPro's Red Pocket review

Plans
PlanDataPriceView plan

Red Pocket 500MB SIM card

0.50GB

$10

View Plan

Red Pocket 3GB SIM card

3GB

$15*

* $180 for 12 Months Service
View Plan

Red Pocket 3GB SIM card

3GB

$20

View Plan

Red Pocket 10GB SIM card

10GB

$22.50*

* $270 for 12 Months Service
View Plan

Red Pocket 25GB SIM card

25GB

$30*

* $360 for 12 Months Service
View Plan

Red Pocket 10GB SIM card

10GB

$30

View Plan

Red Pocket 100GB SIM card

100GB

$37.50*

* $450 for 12 Months Service
View Plan

Red Pocket 25GB SIM card

25GB

$40

View Plan

Red Pocket 100GB SIM card

100GB

$50

View Plan
Review
4.5

Pros

  • Nationwide coverage

  • No contracts

  • Latest selection of phones

Cons

  • Account dashboard needs work

  • No 0% financing options on latest phones

  • Customer service

Benefits

  • Operates on all four networks - AT&T, T-Mobile, Sprint, and Verizon

  • Prepaid cell phone plans - no contract, credit check, or activation fees

  • Bring your own GSM or CDMA device and keep your phone number

  • Mobile hotspot/tethering allowed with your plan data

  • Free international calling to 70+ countries

  • Customer service available in English, Chinese, Filipino, and Spanish via chat or phone

Best GSM SIM card for tablet data

US Mobile SIM Card - US Mobile 2GB data only SIM kitUS Mobile SIM Card - US Mobile 2GB data only SIM kit
Minutes
0
Texts
0
Data
2GB
Price
$10Free Starter Kit with code: MSPUSM
Powered by:

This US Mobile SIM kit includes 0 mins, 0 texts and 2GB data for $10 for 1 month of wireless service. US Mobile plans offer wireless coverage on the Verizon & T-Mobile 5G and 4G LTE networks. To learn more about why this is one of the best cell phone plans, check out MoneySavingPro's US Mobile review

Review
4.5

Pros

  • Flexible, no contract plans

  • 24/7 customer service

  • 5G coverage available

Cons

  • No international calling

  • Phone selection

Benefits

  • Coverage on either the T-Mobile or Verizon network

  • Risk-free trial: Full refund within 14 days or before 1000 talk, text, or MB's is used

  • Prepaid - no contract, credit check, or activation fee

  • Bring your own GSM or CDMA phone or choose from a small selection of phones for sale

  • Keep your own phone number

  • Mobile hotspot use available as add-on option with unlimited data plans

  • International roaming plans available with eSIMs

  • Add-ons available for talk, text, and data, with rollover

  • 24/7 customer support

Prepaid GSM SIM cards

CarrierNetworkMinutesTextsDataPrice
Reach MobileT-MobileUnltdUnltd2GB$10** $10 Off First 3 Months
Mint MobileT-MobileUnltdUnltd4GB$15** Buy 3 Months Get 1 Free
US MobileVerizon & T-MobileUnltdUnltd12GB$20Free Starter Kit with code: MSPUSM
Mint MobileT-MobileUnltdUnltdUnltd$30** Buy 3 Months Get 1 Free
TelloT-MobileUnltdUnltd1GB$10

GSM SIM card benefits

  • Powered by the major US networks: GSM MVNOs provide wireless plans on the same major telecoms service you can trust. AT&T and T-Mobile are the two networks that run on GSM.
  • Save up to 50%: cut your cell phone bill in half and only pay for what you need.
  • No contracts: if you're not happy you can cancel at any time. No early termination fees.
  • Keep your phone: you can bring your own phone and keep your phone number with a hassle-free switch over. Saving even more money.

Best GSM SIM card on T-Mobile

Mint Mobile 4GB plan* Buy 3 Months Get 1 Free

Unlimitedmins

Unlimitedtexts

4GB

4G/5G data

$15/mo*

$3.75 per GB

Powered by: T-Mobile

T-Mobile vs Mint Mobile comparison

Keep your T-Mobile phone, number & coverage: Save $660 per year

CarrierNetwork Coverage4G/5G DataPriceAnnual Cost
T-MobileT-Mobile 4G & 5GUnltd*$70/mo$840/yr
Mint MobileT-Mobile 4G & 5G4GB$15/mo$180/yr
*Don't waste money on unlimited data - Avg. data usage is only 3-5GBSavings$55/mo$660/yr

Best GSM SIM card on AT&T

Good2Go Mobile 3GB plan* 50% Off for 3 Months

Unlimitedmins

Unlimitedtexts

3GB

4G/5G data

$12.50/mo*

$25/mo

$8.33 per GB

Powered by: AT&T & T-Mobile

AT&T vs Good2Go Mobile comparison

Keep your AT&T phone, number & coverage: Save $637 per year

CarrierNetwork Coverage4G/5G DataPriceAnnual Cost
AT&TAT&T 4G & 5GUnltd*$75/mo$900/yr
Good2Go MobileAT&T 4G & 5G3GB$25/mo$263/yr
*Don't waste money on unlimited data - Avg. data usage is only 3-5GBSavings$50/mo$637/yr

What is a GSM SIM card?

All GSM phones use a SIM card. This tiny card is sent by your carrier when you sign up for their cell phone plan. It stores all your phone information, like contacts and personal data. It also makes it super easy to switch carriers.

If you're a frequent traveler, a GSM phone is ideal. You can purchase a local SIM for your unlocked device and save some extra dollars while you're away from home.

Depending on your phone, there are three types of SIM cards;

  • Standard SIM
  • Micro SIM
  • Nano SIM

The Nano SIM card is the most common and is used in newer smartphones like the latest Samsung Galaxy and Apple iPhones.

Don't forget to check which size SIM card your phone uses before signing up.


Which carriers are GSM?

Below is a list of carriers compatible with the GSM network piggybacking off AT&T or T-Mobile. If you're not sure which network is the best for your area, use our coverage map to check.

You'll be sent your GSM SIM card kit in the post with simple activation instructions to help you get started. If you're looking to bring your own phone, check on the carrier's website to make sure your phone is compatible.

T-Mobile GSM carriers list

CarrierNetwork(s)
Boost MobileAT&T & T-Mobile
Boom! MobileVerizon & T-Mobile
Consumer CellularT-Mobile
FreeUP MobileT-Mobile
Metro by T-MobileT-Mobile
Mint MobileT-Mobile
Red PocketAT&T, T-Mobile & Verizon
Republic WirelessT-Mobile
Simple MobileT-Mobile
Straight TalkT-Mobile, AT&T & Verizon
TelloT-Mobile
TingT-Mobile & Verizon
TracfoneVerizon, AT&T & T-Mobile
Ultra MobileT-Mobile
Unreal MobileAT&T & T-Mobile
US MobileVerizon & T-Mobile
Gen MobileT-Mobile
WingAT&T, Verizon & T-Mobile
Good2Go MobileAT&T & T-Mobile
Hello MobileT-Mobile
GoSmart MobileT-Mobile
Reach MobileT-Mobile
LycamobileT-Mobile
Walmart Family MobileT-Mobile
Speedtalk MobileT-Mobile

AT&T GSM carriers list

CarrierNetwork(s)
Boost MobileAT&T & T-Mobile
Cricket WirelessAT&T
FreedompopAT&T
H2O WirelessAT&T
PureTalkAT&T
Red PocketAT&T, T-Mobile & Verizon
Straight TalkT-Mobile, AT&T & Verizon
TracfoneVerizon, AT&T & T-Mobile
Unreal MobileAT&T & T-Mobile
WingAT&T, Verizon & T-Mobile
Good2Go MobileAT&T & T-Mobile
Black WirelessAT&T
easyGO WirelessAT&T
Airvoice WirelessAT&T
Optimum MobileAT&T

Switch to a cheap GSM carrier

Some carriers lock a cell phone to their network. But if you want to unlock your phone, in most cases it's an easy fix. Then, you can use it across any network.

If your current provider is one of the big four telecoms companies, AT&T, Verizon, T-Mobile or Sprint, you'll want to make sure your phone is fully paid off before switching.

With an unlocked phone, you can switch carriers hassle-free. With a low-cost alternative carrier, there's no contract. So, if you sign up and it's not what you expected you're free to switch.

Until a few years ago CDMA phones didn't use SIM cards, but they've now been built to use both CDMA and GSM. This makes it easier to change between the networks.

Considerations when comparing GSM carriers

  • How much talk, text and data do you need? With a low-cost carrier, you can tailor a plan to your needs. By keeping track of your usage you can save money and easily update your plan if needed. Use our free tool to check your average data usage.
  • Bringing your own phone? If your phone is unlocked and compatible with a GSM SIM card this is a great way to save money.
  • Who offers the best coverage? You can use our coverage map to find out which network and carrier work best in your area.

GSM vs CDMA

CDMA and GSM technology was developed for old school 2G connectivity back in the early 90's. While the GSM network is used worldwide, CDMA is used mainly in the US.

But there's a newer technology in town, LTE.

As technology evolved, 4G LTE was created for data only. Still relying on GSM and CDMA for voice and text to fill in the gap when 4G was not available.

So because LTE phones need a SIM card, and the latest CDMA handsets now include SIMs, it's easier than ever to switch with a CDMA carrier.


GSM SIM card FAQs

What is a GSM SIM card?

GSM means Global System for Mobile Communications. All GSM phones have SIM card slots for storing phone information.

Which carriers use GSM SIM cards?

AT&T and T-Mobile use the GSM network. So any MVNOs running on these networks are GSM compatible.

How do I know if my SIM card is GSM?

If your current provider is AT&T or T-Mobile then your SIM card will be a GSM SIM card.


Recap

Saving money on your cell phone bill is easy with low cost carriers. And with a great selection of plans there's something for everyone.

GSM MVNOs make it easy for you to bring your own phone, as long as it's compatible. If you're not sure your phone is compatible you can find out with our IMEI checker.

GSM SIM cards are great if you travel abroad as unlike CDMA, the GSM technology is used worldwide for cell service.

If you're not sure which carrier has the best coverage for you, just pop your ZIP code into our coverage checker to find the best for your area.

Rob Webber
Rob Webber

Rob has 15+ years experience in the US and UK running price comparison sites for cell phone plans, smartphone deals, TV, and internet. He loves thinking outside of the box to build tools that empower consumers to make more informed decisions.