Your network delivers the call to AT&T's network, which then completes the call.
A call over the MicroCell uses just as many bytes of AT&T's bandwidth as it does yours.
careful there, you are about to walk yourself into the discussion that I will personally not assault anyone for, and that is the coverage.
Charge me $20 to hand you my traffic, since I need better reception, and you can't react fast enough but are telling me that you are "upgrading for MMS" (see tilty head "blogger guy").
yea that argument