My LG Optimus G has lost the IMEI after dropping from the chair. The IMEI in My Phone Identity menu said "Unknown" and so did the IMEI SV. The networking is normal, I can access the internet but I cannot have the phone call although the phone has simcard and memory card. My floor is made of ceramic. What can I do to repair my phone.

A repair shop told me that the hardware is the cause, not the software. But they don't have this kind of hardware.

If the hardware is the cause, could you please let me know what is it, what is the product code, eg, so that I can identify it and buy it online.

Thank you,