Data not working on iPhone 3GS?

Cello

New member
I recently bought an iPhone 3gs and I am paying $30 a month for data.My data plan, however, is not working. 3g and data roaming are both on, but when I am in an area with a signal and a friend with the same phone can get mobile Internet, I cannot. I am also unable to send pictures through MMS. Resetting the phone has not solved my problem.
 
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