How can i get my iphone internet to work after updating to iphone 4?

[Reubeni]

I have a Iphone 3G and I've had it since around when it first came out.About 3 days ago i updated to Iphone 4 and now the internet wont work apart from WI-FI.I always have full network and the 3G sign so i have full internet connection but every time I try and connect it says you are not subscribed to a cellular data service,the internet has been working perfectly before the update.PLEASE HELP!
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[DroidRules]

1. Restart phone. If it doesn't help go to step 2.

2. Settings, reset, reset network settings. If that doesn't help go to step 3

3. Hook up iPhone to iTunes and re-install OS.

Good luck.

 

[quietstormSD]

It won't work without wifi unless you put your iPhone 4 sim (with adapter so the micro sim fits the sim tray/slot). This is because your cell carrier deactivated your old sim when you got your new phone with a new activated sim