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Hey, My 2 year Old IPhone 6 cannot seem to get any service I have tried the drop method which does work But only for a small period of time .The phone recognises when the sim is in or out of the phone ,I cannot get the imei number when I call *#06# But can get it in settings. The phone previously had problems with The Touch ID and Charge IC On the motherboard Randomly Breaking and not working but I got them repaired.If anyone has any idea what this is Please let me know , Thanks

This is an issue with the logic board relating to the baseband chip area. You will need to take it to a micro-solder to fix.

Place the non-original chip (ie, a chip other than the bracket on which the device is locked) and connect the device to iTunes through a USB connector. When the device is detected by iTunes, back up and select Restore. (Try restoring without holding Shift / Option, or place the iPhone in DFU mode to do this.) After the restoration process, you will have two options: Restore from a backup and Setup iPhone as a new phone. Choose the second option. After selecting the second option, you must skip the activation steps. After the completion of the activation steps must appear (if nothing happens, repeat the steps)

Also, There is something thing loose inside the phone if that has to do with anything?