Both t mobile and at t use the gsm network and therefore sell gsm compatible phones.
Is att gsm network.
Because of these investments our lte network now covers more than 99 percent of the united states.
In a time where prepaid services are very attractive and more and more phones are available as unlocked models that work on a variety of 5g 4g lte and 3g gsm cdma bands this a question you.
Investing in the network.
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We built it by continually investing billions of dollars in expanding our coverage and improving our lte network for customers.
The core technology standard for the at t mobility wireless network is called global system for mobile communications or gsm.
Verizon will turn off its cdma network and t mobile will turn off its 2g gsm network by the end of 2020.
If your own carrier uses gsm technology and you are unable to your device in another gsm network that s probably because it is gsm locked.
Gsm vs cdma the rival of gsm technology is cdma.
In 2021 at t and t mobile will keep their 3g networks in very low bandwidth modes mostly.
See the tables below for details.
Cell phone customers at t and t mobile are gsm carriers while verizon sprint and us cellular are cdma taking into account updates in carrier policies and plans to close off networks.
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At t united states uses 2 gsm bands 2 umts bands and 4 lte bands.
Much of the at t network footprint now uses umts hspa version 2 standard 3gpp wireless technologies umts hspa for simultaneous circuit switched voice and packet switched data communications.
However if you have a phone made in the last couple of years you probably don t need to worry about which carriers use gsm or cdma networks since most newer phones work on both networks.