@dhoni ..dont call any numbers.Just dial *121# and a menu will popup.From there onwards you only need to send the response by sending numbers in a sms.Like to select option 5 for stopping a service.Just follow the instructions.Even when I got my new connection,I got activated for some hello tunes without my approval.I instantly deactivated.They tried to pull that shit again.But I did the same thing over.Now presently I am not getting activated automatically.Also register your number in DND registry by sending a sms "START DND" to 1909 without the quotes.AIRTEL are daylight robbers. One more thing I have noticed.In their internet schemes (i am talking about gprs plans here) they have 3 plans.One is the so called unlimited (but with 2GB limit) , then there is the 3 day rental , and lastly there is the no rental which costs a bomb.So here is the story, AFter I got my sim activated I recharged it with 98 rupees and activated the 98 rupees plan.After a month the plan got deactivated as I had no money in my account.I had to keep my account low coz of those arsehole airtel pulling tricks.So I recharged this time with 60 rupees and some 52 rupees got credited to my account.So I dialed *567# to activate the 98 rupees plan.I was sure they wont let me activate it coz of low balance.But to my surprise this time it showed that there was a plan for 46 rupees with 1GB for 15 days.So I activated it.Then I checked the data amount..... to my surprise it showed remaining amount 512MB and valid for the next 15 days.What the f*** is this ? They advertise it as 1GB and then give only 512MB ? Well thats not the end of it.AFter the 15 days were over,I had some 25rupees left in my account.I thought the net would just stop working as I hadnt renewed it or whatever.But I got a sms saying "thanks for activating 3 days 15 rupees plan". What the F**** !Thats what they do, they just assume that you want to continue on with their services.Without even asking you they just auto activate everything.Bloody bastards.So this is what I have learnt so far.If you dont want them to auto activate or auto renew your services, then you must deactivate them before their expiry.Just 2 days advance deactivation will do.That way you have no active services for them to suck your money.