Airtel — I am not getting signal on my phone

Address:

Bangalore, Karnataka

My sim is 4g and handset too but while i was travelling from bangalore to bhubaneswar i lost signal on my phone and now it's not coming. I tried to switch on off the phone but still no signal. Please look into this i am unable to contact anyone. It's being very problematic. I am not able to understand the problem of my sim card. It has been days that i am without signal on my phone.