Carrier Switch

OK, so I'm sitting at home playing with my iPhone 3g. I lose service in a place I never typically would lose service, after about a minute, my service comes back, but instead of AT&T at the top, it read Centennial Wireless. Centennial Wireless was scrolling across in the space that usually reads AT&T. Now as far as I know, you can't even use the iPhone on Centennial's network because they're not compatible. Correct me if I'm wrong. But I'm not making this up, I didn't photoshop an image or anything. I just want to know why it did this. The phone read AT&T again once I turned it off and back on. I've attached a picture of the screenshot I took while it was doing this. Thanks for your help.

 

You are roaming, thats gonna get expensive.

General > Network > Data Roaming (turn this off)



Yeah I should have mentioned this before, after it did that the first thing I did was check to see if my data roaming was on. Which it was not. I've never even turned this on for obvious reasons.