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Can I use my AT&T phone with another carrier?

Is AT&T a CDMA or GSM network?

AT&T is a GSM network carrier and works with GSM cell phones.

GSM stands for Global System for Mobile Communications. GSM and CDMA are the 2 types of 3G networks that cell phone carriers use to provide your service.

Find Cheap Cell Phone Plans in Your Area

In the past, you couldn't use a CDMA network's phone on the GSM network and vice versa. However, most newer smartphones can operate on either type of service.

Some older phones can as well, just make sure you research your specific device to find out whether it's compatible with both before buying a cell phone plan.

Check Carrier Coverage

AT&T GSM network carriers

If you're shopping around for a new carrier, consider MVNOs - Mobile Virtual Network Operators. These are smaller mobile providers that rent space on the same networks the big guys use and then sell it to you at a lower price.

There are plenty of great AT&T MVNOs to choose from, such as PureTalk, h20 Wireless and Red Pocket which means you can get AT&T service without paying AT&T prices.

AT&T vs h2o Wireless Plan Comparison

Keep your AT&T phone, number & coverage: Save $562 per year


Network Coverage

4G LTE Data


Annual Cost






h2o Wireless





*Don't waste money on unlimited data - Avg. data usage is only 3-5GBSavings$45/mo$562/yr

AT&T GSM low cost carrier benefits

  • Get the same great service: You get cell phone service on the very same networks the major providers use.

  • Save over half: MVNO plans typically save you 50% or more over the big four carriers.

  • Custom plans: Only pay for what you actually need and use.

  • No contracts or credit checks: No commitment and everyone is welcome!

  • Keep your phone: Most MVNOs are BYOP (bring your own phone) - keep your device and your number.

AT&T GSM carrier plans





Pure Talk



$15** 25% Off for 3 Months

Red Pocket

AT&T, Verizon, T-Mobile & Sprint



Unreal Mobile



$25** $10 Off for 1 Month

Good2Go Mobile

AT&T & T-Mobile



h2o Wireless



$22.50** 25% Off for 3 Months

AT&T GSM unlocked phones

You can also save a bundle on your smartphone by purchasing a used or refurbished GSM phone to go with your new plan.

Bring your own AT&T GSM phone to a cheaper carrier

  • Save half or more off retail: For less than half the price you can get a smartphone model just a year or two old.

  • It's a great value: Most model years only see minor tweaks to existing smartphone designs. Get a steal of a deal without sacrificing the features you love.

  • Keep your freedom: Buying your phone outright means you can leave your carrier any time you want - like when you find a cheaper cell phone plan.

AT&T GSM companies list



Pure Talk


h2o Wireless


Red Pocket Mobile

AT&T, Sprint, T-Mobile, Verizon

Straight Talk

AT&T, Sprint, T-Mobile, Verizon


AT&T, Sprint, T-Mobile, Verizon

Consumer Cellular

AT&T, T-Mobile




AT&T, Sprint

FreeUP Mobile



AT&T, T-Mobile, Sprint, Verizon

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.


How do I switch to AT&T?

Switching to AT&T is smart, quick and simple. You don't have to buy a new phone, since you can bring your device to AT&T. You can keep your old number. All you need to do is order a AT&T SIM card and once you have that, you can switch your phone service in as little as 2-3 minutes.

Does AT&T have network coverage in my area?

AT&T is powered by AT&T, meaning you get the same nationwide 4G LTE coverage as you would if you signed up to AT&T directly.

Can I keep my phone number when I switch to AT&T?

Yes! It's easy to port your existing phone number to AT&T during the activation process.

Can I bring my phone to AT&T?

Yes! Most unlocked smartphones that have a SIM card slot will work with AT&T. If your phone is locked to a carrier you will need to contact your existing carrier to get it unlocked.

AT&T Network Specs

3G Bands:850, 1900MHz
4G LTE Bands:1900, 1700/2100, 850, 700, 2300Mhz
Bring Your Phone:Yes
Keep Your Number:Yes
Contract:No - Postpaid
Credit Check:Yes
Prepaid:No - Postpaid

AT&T Company Info

Headquarters:208 S. Akard St. Dallas, TX 75202
Customer Service:(800) 331-0500
Website:Go to Website
Wikipedia:Go to Wikipedia
Facebook:Go to Facebook
Twitter:Go to Twitter
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