Dear Airtel forum gurus - I have a strange problem with 4G SIM activation. I was using an Airtel pre-paid SIM card for the last year while I was roaming outside India (currently in Europe). The SIM card worked perfectly. Last month, I had some issues with the SIM card being recognized on a new phone. I ordered a new 4G SIM card to my home in India and had the inactivate SIM card shipped to me by my relatives in India. I have the new SIM card and followed the activation procedure. The new SIM card does not latch on to any network now. The worst part is that even the old SIM is not recognized on the roaming network. Any ideas on how to solve this? I have opened a ticket with Airtel and waiting for a call back.