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23-09-2011, 01:50
They are just incompetent I guess. AT&T use exactly the same network standards as the rest of the GSM/UMTS-world including HSPA. Even if your phone wasn't compatible with their 3G network (e.g. if you had a European HTC Desire which supports UMTS only at 900 and 2100 MHz), it would still work on AT&T's 2G network.
There shouldn't be any issue except for a slightly inferior 3G coverage due to your phone not supporting UMTS at 1900 MHz.
terminals: Samsung: Galaxy S5 DuoS (G900FD); BLU: Win HD LTE; Nokia: 1200; Asus: Fonepad 7 ME372CG; Huawei data: E3372, Vodafone R201, K3765, E1762;
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