I purchased an iPhone and jailbroke it. A few months ago, I ended up having the battery die and I replaced it. I had a problem with the repair and that turned into a nightmare. Anyways, the phone is fixed! Anyways, I want use the EDGE data that is on my family's plan. I'm a grad student and since I'm on campus most of the day I don't need the 3G connection. We have WIFI. I called ATT and they want to change the data plan from EDGE to 3G. It's an extra $20 a month. I know not much, but I don't need the plan and it would be money that I'd rather use else where. I was told I can just change the IMEI number and ATT won't know the difference. I went to iClarified and saw the instructions to do it. Do I need a new phone or can I just change it to my old BB phone's IMEI number? Can they find out that I changed the IMEI number? Also, iClarified states: What is BL? How do I check it? Thanks for any help or answers you can give.