Roaming Icon on Home-Network I have an Xperia L mobile , I'm from India and having AirTel Network Connection.
The problem is on the mobile network icon,it shows Roaming Symbol since I'm in home network.I made a call to the customer care,they replied that the problem is not on their side (they haven't charged for Roaming). Can anyone help to get rid out from the issue.

Does keeping the mobile data on for all time have an impact on battery ?
Basically roaming icon comes on two chances,

When you are in the different state.
When you are in the same state but in a union territory or capital of the state(only in few states)( like : Airtel,Vodafone treats Chennai as one place, Pondicherry as one place and rest of Tamil Nadu as another place. So if I buy a SIM from some city other than Chennai in Tamil Nadu and when I move to Chennai, the "R" symbol appears.).

So, you don't have to worry. You wont be charged. And it doesn't drain your battery. And you can keep your mobile data on, it wont make any difference if you are in roaming or not.
Mobile Data wont charge you extra.