In my experience CELLONE is simply the undefeated champion in providing the worst service among all. The customer service number is out of reach, would u believe it.! They torture u daily with new problems. Few days incoming calls are barred, other days outgoing sms are barred.
I am unable to even port my number as the outgoing SMS is barred. And the customer service guys are really poor in knowledge. never ever ever make a mistake of subscribing to CELL ONE in karnataka.