Can anyone pop in a SIM from T-Mobile's iphone 5 to see if it works. Your help would be greatly appreciated.
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Sent from my HTC One using Tapatalk 2
That's not entirely true. The Droid Ultra and Maxx out of the box can connect to AT&T's network just by popping in the SIM, and those are exclusive to Verizon.
http://www.droid-life.com/2013/08/22/droid-ultra-can-connect-to-atts-hspa-network-out-of-the-box/
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I think that only is the case for Verizon phone. IIRC, due to regulatory reasons, Verizon LTE phones must be unlocked on HSPA/GSM networks. AT&T phones do not have any such restrictions and are locked only to AT&T.