Suddenly can not access a cell signal overseas.

I've been traveling in Asia for a week and have not had any problems.  When in the Shanghai airport yesterday I turned my phone off to conserve battery and then back o again when I needed to use it.  When I turned it back on, it could not find a signal.  The screen showed that the phone was "searching" for a signal.  Other iphone 4 users with me are not having any issues.  I'm with AT&t if that makes any difference.   Also, my international assist is on and my carrier network selection is set to on.

Let’s first make sure that the update is installed properly, and post back with your observations when done.
Verify/repair the startup disk (not just permissions), as described here:
The Repair functions of Disk Utility: what's it all about?
After having fixed all filesystem issues, if any, reinstall the update that appears to not have been installed properly. You may also need to reinstall the Combo Update for the type of computer and the version of Mac OS X you’re using, unless this is the version of Mac OS X that came with your computer:
About the Mac OS X 10.4.8 Combo Update
Mac OS X 10.4.8 Combo Update for PPC
Mac OS X 10.4.8 Combo Update for Intel
Take a look at the following articles for guidelines on how to properly install system updates:
Troubleshooting installation and software updates
Installing software updates
Basically, you should verify/repair the startup disk before installing the update, no applications should be running while installing it, and you may experience unexpected results if you have third-party system software modifications (not normal applications) installed.

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