Iphone 3GS "cannot connect to data network"

Ever since I updated to the new operating system, my phone (3GS) hasn't worked properly. Sometimes with 3 or even 4 bars of 3G I cannot make phone calls or send text messages or use the browser. I feel like I've tried everything; I have: restored it, restarted it, reset network settings. I receive the "cannot connect to data network" very often, extremely frustrating. If anyone has any fixing advice, it would be greatly appreciated. Thanks

If no change after restoring your iPhone with iTunes as a new iPhone or not from your iPhone's backup, there may be a problem with the SIM card. Contact your carrier which should be Rogers with a 3GS, and request a new SIM card.

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*[[/questions/918127]]
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Iphone 3GS "cannot connect to data network"

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