Originally Posted by
breaux124
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I thought Tmobile piggy backed off of AT&T towers in some areas? And since Tmobile on works on 1800/1900 MHz, where AT&T runs dual band 850 & 1800/1900 I would think AT&T would usually have better coverage (if your phone supports both signals)
In the US, T-Mobile uses 1900, but has roaming agreements with some carriers that use 850 (including AT&T in
some places). AT&T uses both 1900 and 850.
900 and 1800 are used in many places outside of the Americas.