No service after battery replacement?
I replaced the battery in my iPhone 4S, since then the phone says 'Searching' or no service in the upper left corner. I tried switching the date back to 2013 but the problem still persists?
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Check to make sure you didn't damage/disconnect the cellular antenna when removing or inserting the battery. It's cable runs along the spear assembly parallel to the bottom of the battery.
This link shows you where it is and how to replace it.
iFixit_Iphone_4s_Cellular_Antenna_Replac...
If you need the part: iPhone-4S-Cellular-Antenna
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What you have to do is just connect your iPhone to iTunes via data cable for 2 minutes.
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