Unfortunately, my Intex Aqua 4G Strong handset does not seem to work with Airtel 4G network. The issue could be that Airtel's 4G is on LTE band 40 (2300 MHz) which does not seem to be supported by this handset. So, currently, even when Airtel4G is seen as an available network using Settings -> More -> Cellular Networks -> Network operators, and when chosen, shows "Registered on network", the status shows 3G, and apps like Coverage and Phone tester show the connected cell to be WCDMA / HSPA and not LTE.
Phone tester was earlier indicating that this handset was not reporting GPS connections. Maybe it lacks antennae for GPS and LTE band 40? Using Phone tester with the Mi3 would take a couple of minutes for first connecting to a GPS satellite, and later, after closing and opening the app, would connect within seconds even indoors.
Edit: I emailed 121 at airtel dot com with my 4G connection issue. They called back in the evening, saying that it was an issue at their end, "we would like to inform you that due to some technical issue, internet service on your mobile was not working. However, we have reset the internet service for your mobile.
We request you to restart the handset before using the internet service."
I restarted after seeing their email, and the phone connected to 4G :)
Phone tester was earlier indicating that this handset was not reporting GPS connections. Maybe it lacks antennae for GPS and LTE band 40? Using Phone tester with the Mi3 would take a couple of minutes for first connecting to a GPS satellite, and later, after closing and opening the app, would connect within seconds even indoors.
Edit: I emailed 121 at airtel dot com with my 4G connection issue. They called back in the evening, saying that it was an issue at their end, "we would like to inform you that due to some technical issue, internet service on your mobile was not working. However, we have reset the internet service for your mobile.
We request you to restart the handset before using the internet service."
I restarted after seeing their email, and the phone connected to 4G :)