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I updated to the new 5.1.1 system and it is causing major problems! Safari quits through the middle of a search and SMS doesn't work at all. I have tried all the recommended fixes I've seen so far such as restoring the phone (multiple times), removing all VPNs, switching on and off, swithcing off imessage, contacting the SMS server to check the number is correct,
I'm out of ideas!
Anyone know how to fix this? If not my iphone has just become a lump of junk and I will need to change phone!
Settings > General > Reset > Reset Network Settings
Beyond that... since you state you've tried all "recommended fixes" have you actually restored as new and not from your backup?

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