So basically, here's what has happened:
I bought a jailbroken iphone 3g from a friend. I activated a Straight Talk sim and added a service plan and could text and call. I couldn't use the Wi-Fi or internet though and couldn't change the APN settings because "cellular Data network" wasn't showing up in settings.
I talked to someone at a local AT&T and they told me Cydia was causing the problems so do a factory restore in itunes to unjailbreak it. I did that, which locked the phone back up AND the Cydia app is still on the phone. I got the phone professionally unlocked, reinserted my Straight Talk sim, but now I still can't access Wi-Fi or internet and now I can't even text or make calls!
Can anyone explain what's happening please? I've been searching the internet for days but I can't find an answer anywhere and live too far from an Apple Store to get immediate help and I emailed Straight Talk customer service but I haven't heard back yet )