Network status "No Service" abroad
Hello.
After arriving in India, the iPhone has connected to one of the local operators without a problem. When visited a branch of the local Airtel operator the trader was entering some dial codes on my iphone, calling somewhere, recieving sms etc., then finally managed to get a new Airtel simcard working.
But now, after inserting my previous Czech sim card back, the iPhone no longer connects to any local network. The status bar says "No Service". If I insert the sim card into another phone, it immediately connects to the network.
After resetting the network settings, still no change.
Perhaps a complete reset of the phone would help? Could I use the latest backup then? Or maybe ask at an Airtel branch?
However, firstly I would like to ask here, if any of you would be willing to explain why this is happening or how to fix it.
I would be grateful for any advice, information or guidance.
iPhone 6s
