Iphone 4- Facing severe network issues after upgrading to software 5.0.1

Hi,
I recently 'upgraded' my phone software to version 5.0.1 and have been facing severe network connectivity issues. Gprs does not work most of the times and I keep getting "No service" message in the network antenna area.
Please help!
Is it possible to switch to the old software version?
Thanks,
Parul

Downgrading is Not supported by Apple.
Have you tried Settings > General > Reset > Reset Network Settings...
Also...Some Users have Reported that a Restore as New has helped Resolve issues...
Backup and Set Up as New Device
http://support.apple.com/kb/HT4137
iPhone User Guide

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Iphone 4- Facing severe network issues after upgrading to software 5.0.1

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