I've currently got a iPhone 3gs sitting on the T-Mobile network and when I'm in my office I get no signal.. Once I leave the building it takes minutes to reacquire the network signal -- frequently about 3-4 or more minutes. I realize that the iPhone 3gs is not talking on all available frequencies for TMO but thought I'd ask -- if the same sort of situation was to be done using the Nexus 4, how long might it take the Nexus 4 to reacquire a TMO signal?