Update the towers that your GSM iPhone is connecting to

[cellulartalk]

With GSM (AT&T, T-Mobile) the towers that your phone connects to should update automatically, but if for some reason you find yourself not getting a signal where you were getting a signal before, or you only get 3g where you got 4g before, try turning off the phone for a couple minutes and then...

More... (http://www.howardforums.com/showthread.php/1801751-Update-the-towers-that-your-GSM-iPhone-is-connecting-to?goto=newpost)

Courtesy of WestNet Wireless
www.westnet.ca