Problem with iOS 4.2.1 on iPhone 4

Hi,
I have a iPhone 4,it had iOS 4.1 and worked fine, since i updated to iOS 4.2.1 3G signal lose and i can not send MMS, will i have to downgrade? o do i need something else?

There is no legit way to downgrade.
Have you tried basics from the manual?
Restart.
reset.
Restore.
Troubleshooting MMS:
http://support.apple.com/kb/TS2755

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