Chosen Solution

Hello i have an issue with this phone is that it shows there is no service even when there is SIM inside , i tried different Sims with different carriers , still the same problem i want to ask , i found that one of the legs of this antenna is damaged , the one is tightened with screw to the top edge of the phone ( not on the board ) , only this leg is damaged , could it be affecting the problem ? ( attached photo of the antenna ) even though the wireless and Bluetooth is working fine what could be the problem ? IC or damaged sim reader ? thanks in advance for your help Update (05/21/2018)

this metal part is not there , could it be causing the fault

Can you post a picture of the damaged antenna?