From the T[[iPhone 5 Troubleshooting#Section_Weak_or_lost_wireless_connections|roubleshooting guide]]:
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From the [[iPhone 5 Troubleshooting#Section_Weak_or_lost_wireless_connections|Troubleshooting guide]]:
Weak or lost wireless connections
You have trouble connecting to a wireless network or your calls are suddenly dropped.
Dirty antenna grounds
If your iPhone has been disassembled before, it's possible that finger oils were left on the grounding locations for the Wi-Fi or Bluetooth antennas. These oils will cause grounding issues for the antennas, which could lead to a weak signal or no connectivity at all. Be sure to clean all grounding points with an electronics cleaning solution before reassembling your iPhone to prevent grounding issues. Follow the display assembly guide to open the phone to access most of the phone's contacts.
From the T[[iPhone 5 Troubleshooting#Section_Weak_or_lost_wireless_connections|roubleshooting guide]]:
Weak or lost wireless connections
You have trouble connecting to a wireless network or your calls are suddenly dropped.
Dirty antenna grounds
If your iPhone has been disassembled before, it's possible that finger oils were left on the grounding locations for the Wi-Fi or Bluetooth antennas. These oils will cause grounding issues for the antennas, which could lead to a weak signal or no connectivity at all. Be sure to clean all grounding points with an electronics cleaning solution before reassembling your iPhone to prevent grounding issues. Follow the display assembly guide to open the phone to access most of the phone's contacts.