Unfortunately, the battery is (and I have paid close attention to the APN) exactly the problem with the constant reboots caused. Had then the old battery installed. Although the no longer has as much capacity, but I can use the iPhone again. Will return the battery today. What a pity. SUPPLEMENT: After a prompt reaction by Avanto I quickly got another battery Sent. Built and works einwandfrei.Ich am very pleased about the settlement and the functioning battery.