After replacing the battery the phone wouldn't connect to GSM. At first I thought it had to do with the pressure contact that connects to the back cover so I redid it a few times but no luck. Finally had to take it to a service center, luckily the solution was only a few minutes away. Connect the phone to a wifi network, pull the SIM card and then insert it again after a while, enter your pin and you"re up and running again. I was not the first customer who had entered the shop with this problem. Best wishes from Sweden!
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