No Service/ one bar

[bfunk04]

So my iphone 4, jailbroken and on tmobile, started giving me the no service slash one bar this morning. It has done this before but usually a restart of the phone fixes the problem. This time, no matter what I do, I still get the no service. I put in my friends ATT sim, and got service immediately and everything worked great.
I try reinstalling ultrasn0w and still no service. Any idea what the problem could be?

[seann33uk]

Towers down?
Large Blimp blocking signal?
A lot of people on the network?

If its not working for tmobile but is for AT maybe try in a different area see if you get same results.

[bfunk04]

I did. I actually drive 30 miles away for work earlier and still no service.

[jdm.accord]

I'm having the same issue with my iP4 and T-Mo. Something is going on with ultrasn0w I think