I am planning to try xfinity mobile with my at&t phone (unlocked by at&t) - which according to the byod section on the website, should work. My question is, once I get the phone working on xfinity mobile, will I be able to put my at&t sim back on and use it. Basically be able to switch back and forth while I try it out and decide what network I like?
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If you bought the phone from AT&T (and it’s an iPhone 7 or 8) even after it’s unlocked it probably won’t work on Verizon or Xfinity mobile . You need a Verizon or Apple Sim free version that has the QUALCOMM modem rather than the Intel modem.
If the phone works on Xfinity network you could switch back-and-forth but you will probably have to use two different phone numbers. Once you port the number from AT&T that SIM will be dead.
So, I decided to just try it out, and it all worked perfectly.
1. unlocked the iphone (7 plus) on at&t
2. went to xfinity store and got an xininty number and sim
3. xfinity sim worked on the unlocked at&t phone
4. swapped at&t sim back on, and at&t sim worked great.
So, basically, I can now use either sim on my unlocked at&t phone.