AT&T GoPhone SIM Compatibility Issues

Bossman · 01-12-2010, 10:39

I will not call it crappy AT&T coverage. This certainly sounds like, as already mentioned, your phone is NOT quadband. It's missing the 850 band that AT&T uses heavily.

My experience with my supposedly quandband dual-sim chinese phone is that, ONLY sim slot 1 on my phone has the 850 band. The sim slot 2 almost always latches onto tmobile regardless of the sim I put in it. I tested it with a number of reaming sims I have. When I put my AT&T sim in it, there was barely any signal.

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Bossman (Offline) Senior Member Prepaid Professionist Posts: 1,257 Join Date: 22 Apr 2005 Location: Chicago Country:	01-12-2010, 10:39 I will not call it crappy AT&T coverage. This certainly sounds like, as already mentioned, your phone is NOT quadband. It's missing the 850 band that AT&T uses heavily. My experience with my supposedly quandband dual-sim chinese phone is that, ONLY sim slot 1 on my phone has the 850 band. The sim slot 2 almost always latches onto tmobile regardless of the sim I put in it. I tested it with a number of reaming sims I have. When I put my AT&T sim in it, there was barely any signal. Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3, Sim cards: AT&T (Contract), 3 UK, Piranha Mobile