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> i wonder if my microcell will work with tmobile?

It will not. Instead of a dedicated unit T-mo uses UMA to allow phones to make calls via any wifi connection.

http://en.wikipedia.org/wiki/Generic_Access_Network

I believe it had previously been implemented in hardware (BB Curve etc.), these days it's implemented via software for Android handsets. Not yet supported on iphones.

I'm in Cole Valley too, and being in the shadow of Sutro causes all sorts of RF issues, especially on the southern half of the neighborhood. AT&T and Verizon are worthless, T-Mobile is barely usable, and the TV signals coming from Sutro pass overhead, while the mountain itself blocks NBC coming from the south. Even Monkeybrains has had trouble with Cole Valley.

I love the neighborhood, but the wireless situation sucks.

Sorry - I'm in Dallas.