I recently moved my number from my LG straight talk phone to a (ATT) Iphone 4, was walked though the process of buying a SIM for the device.. it was activated and number transferred. able to make calls, get texts and emails, pictures through imessage have not tried it any other way to see if they come through. Phone does connect to the internet but is EXTREMELY SLOW!!! so slow that I basically time out and have to rely on wifi to get any updates. But was told after 24 hours that the "HOME E" in the upper left corner would change over to 3G or 4G, but it still has not done this. I have restarted the phone several times to see if this will fix the issue if there is one, but don't know if something is still not right with the settings on the phone, or if I have a bad SIM. Because I don't want to just rely on wifi.. I want my phone to work on its own net if need be to be able to get updates.