You walk up to the service counter and have them check your settings and your account. You might not have the data plan (yes, folk keep trying to avoid that but the carriers are getting better at requiring it or blocking its use.)
I have an unlocked apple iphone 4, (at&t) using the sims card form my nokia e71. My phone works good, just cant get my interent to work, and multimedia messaging. How can i fix this? Anyone with any suggestions please help!!