I updated to IOS 5 and now my signal strength drops sometimes clear to zero when I open an app.

I updated my Iphone 4 with the IOS 5 operating system.  When I use an application, including the phone app, my signal strength bars will drop from 4 or 5 bars to 1 bar and sometimes to no bars and searching for a signal.  When I exit the app the bars return tto what they were before.  I have an AT&T plan that operates in Mexico which is where I am now.  In Mexico it operates on the TelCell network.  Before updating the op system I had no problems with the signal strength dropping when I used an app.

Hello timfromharris,
Have you gone to your date and time settings and verified that "set automatically" has been checked?
If you don't know where to go, it's Settings -> General -> Date and Time.
Good luck!
Brendon

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