Hi bros. I recently bought an iPhone 4 who just got replaced by the warranty of the previous owner. It's totally new, never been used etc. In order to activate the phone, I needed a SIM from a specific carrier, and I got some dude in a store to do it for me. Since I've heard the phone was supposed to be locked to this same carrier (which I don't have), the first thing I did when I got home after activating it was to jailbreak it and install Cydia. I later found out that since I have the doomed BB 4.11.08, a jailbreak wouldn't do any good. Here's the weird part. I later bought a sim card with that same carrier the previous owner said it was locked to, and that was used to activate it, but guess what, no signal. The even weirder thing is that the phone now accepts sim cards from two different carriers without stating that these sims aren't accepted. Does this mean that it isn't locked anymore? And why don't I get any signal with any of those two carriers? At one moment I was wondering if the phone might have been stolen, and therefore IMEI blacklisted, but some dude told me to try this site: https://selfsolve.apple.com/agreementWarrantyDynamic.do which supposedly tells you if this is the case. Can anyone help?