Did you have the 5.0 carrier installed before? Once you do a restore, those settings get replaced back to whatever is released with the firmware. 3.5 I think for the 3G? You'll have to add the 5.0 carrier back
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 iPhone 3GS 3.1 Jailbroke! Dell Inspiron 1525 iPhone 3G Jailbroke with BlackRa1n and made into a Touch on 3.1.2
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