iTracker app from Cydia helps you get your iPhone back if stolen/Lost. As soon as somebody who has your iPhone puts their SIM card. It iTracker automatically sends GPS SMS & SMS to 3 of your registered mobile number which could be anybodies whom you know! As soon as there is a SIM card change it sends a SMS out. You will have to register your SIM card as soon as you install this app from Cydia. It’s very simple just open the app Tab on register SIM. so now you don’t have to worry about your iPhone even if it is Lost/Stolen.