I have an unlocked, unbranded Lumia 620 that currently has a T-Mobile Sim (Pay by the Day plan). I use it mainly as a backup phone/media device on WiFi. My primary phone is a Lumia 920 on AT&T. Amazon had the Lumia 520 AT&T Go Phone on sale for $88 over this past weekend, and I lost my head and bought one (should arrive on Thursday). Not exactly sure what I'll do with it yet, but I just couldn't pass up that bargain. I've been a bit underwhelmed with T-Mobile's service in my area. It's a bit hit or miss depending exactly where I am. What I'm wondering is would I be able to use the AT&T Go Phone Sim that comes with my 520 in my 620? In other words, could I swap the AT&T Sim between the two phones? I believe I've read here somewhere that the 620 works on AT&T's bands. If that's the case, then I'm guessing I should be able to swap the Sim between the two phones. Anyone know for sure?
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