My iphone 3g stays on the loading symbol

Sometimes i will be using my iphone and then it will just freeze and have the loading symbol symbol come up it then stops and i turn it back on and it works normaly.Also i can not send or recive text messages or use my mobile data network on my iphone 3g.But this has only happend since i upgraded to ios 4.2 please help me because i am completly stuck whith what i should do.

Have you tried basics from the manual?
Restart.
Reset.
Restore.
http://manuals.info.apple.com/enUS/iPhone_iOS4_UserGuide.pdf

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