I am a prepaid customer of airtel kerala circle.I have been using this network for last 8 years.My number is 9895#01.If I reduce recharge, they will give more offers.They are giving special offer Rs97, so I enjoyed with unlimited benefit. I sent port message to airtel two times due to its unfair call rates.Their customer care executive respond within 1hour. They give call rate offer, that is 100% free for 90days.I liked their service too much.Because they understand customer mind.They are very interest to give offers to existing customer.My phone is dual mode.So my primary number is airtel now.