Mail in Repair: Blue coil iPhone 4, Iphone 4S No Signal fix Blue Inductor Coil repair replacement service | CyberDocLLC | iPhone and Apple Products Hardware Repair Solutions
Troubleshooting "No Service" Error on iPhone 11 Pro Max
No Service or Constantly Searching on iPhone 4, 5, 5s, 5c - Try 8 Possible Solutions Right Now!! - YouTube
iPhone 4S: Fix Searching / No Service Signal After Battery Replacement - YouTube