Hello I am having an issue sort and I am pretty much stumped I have an iPhone 5 from AT&T. I recently got an upgrade and purchased the 5S. Now the current iPhone 5, I would like to give it to my girlfriend. When I got the device, I had it immediately "unlocked" through an Ebay reseller. According to (http://iphoneimei.info/), it says the device is SIM LOCK: Unlocked. When I put in a SIM card other than AT&T's, the device restarts and I see "Requires Activation," followed by an Invalid SIM message which request the original SIM to be inserted. If I insert my SIM from the 5S, everything works fine. Any advice on how I can solve this? Info about device: iPhone 5 Replacement from Apple. Ios 7.0.6 (JB) (I would like to keep the jailbreak..) Thank you very much, I appreciate the help!