Can I use AT&T iPhone 7 on T Mobile?
iPhone 7 Models From AT&T and T-Mobile Do Not Support CDMA Networks. A customer that purchases an iPhone 7 from Apple's website and selects AT&T as their carrier, for example, would be unable to later use the smartphone on Verizon, Sprint, or any other CDMA network, even if the device is unlocked.
Both carriers run their networks on GSM technology, so once your phone is unlocked, just pop in your new T-Mobile SIM card and you'll be up and running. AT&T and T-Mobile both use Band 4 for their LTE service, so 4G LTE devices should be able to access the network without issue.
- In the US, Sprint, Verizon and US Cellular use CDMA. AT&T and T-Mobile use GSM. Most of the rest of the world uses GSM. The global spread of GSM came about because in 1987, Europe mandated the technology by law, and because GSM comes from an industry consortium.
- Verizon is a CDMA carrier, and operates on a different technology than AT&T and T-Mobile (which are GSM). However, you should still be able to use your unlocked Verizon 4G LTE device on AT&T or T-Mobile, as most handsets will be compatible with both carriers' LTE bands.
- Technically, it's possible to use a Sprint phone on T-Mobile or AT&T's GSM networks, if your device is LTE-capable or an iPhone. However, you can still use your handset on a Sprint MVNO, such as Ting, Boost Mobile, or Republic Wireless.
The Verizon and Sprint variants have CDMA and GSM chips on the inside, and can be taken to any other carrier as long as the phone is unlocked. That means you can't use an AT&T or T-Mobile iPhone on Verizon or Sprint, since those versions don't have CDMA chips.
- All unlocked phones work on carriers that use GSM networks. Popular U.S. carriers that use GSM networks include AT&T, T-Mobile, Cricket, MetroPCS, Simple Mobile and Tracfone. You will need to use a SIM card from a GSM provider to get service for your unlocked phone.
- The iPhone SE Is Not Carrier Agnostic. The iPhone SE comes in two hardware models in the U.S., and neither one will work on all four U.S. carriers. The AT&T, T-Mobile, and Verizon units, as well as the unlocked unit, do not work well on Sprint or on Canadian carriers.
- AT&T uses GSM technology, just like T-Mobile. Verizon and Sprint, on the other hand, use CDMA, which stands for Code Division Multiple Access. All it means is that Verizon can pile on several people to use its network at once.
Updated: 21st November 2019