I recentely changed my network provider from vodafone to 3, vodafone unlocked my 3gs and everything was okay until I tried updating to ios 5.1.1. itunes did a factory reset before updating the ios which locked my iphone back to my former network.

I have contacted vodafone and they say they have unlocked the phone again but when I try to synch it with itunes I just get a message saying that there is no sim card installed and to disconnect the phone, insert a sim card and try again, which I have done several times to no effect. The phone itself starts the activation process but cannot finish it saying that the activation server is temporarily unavailable. I have phoned my current provider and my former provider who were both very unhelpful really. I have tried to phone apple but hung up as they charge £25 to speak to an advisor. As I'm self employed and work outdoors all day my phone is a necessity for my business. Can anyone suggest how I can resolve this issue? Please.

Go to iTunea>Preferences>Devices and see if there is a backupright at the time you did the update. Then try restoring from that backup. If the apps are in your iTunes library, any app data will be restored to the iPod.
When restoring from an iOS 4 (or later) backup, if the device had a passcode set, iTunes will ask if you want to set a passcode (and remind you that you had protected your device with a passcode). iTunes will not ask you to set a passcode when restoring from iOS 3.x and prior backups.
Therefore, remembe the passcode that you enter this time.
It appears that if you restore from a backup, that backup is not subseqyently overwritten by the next backup.

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