Friends I am using vodafone sim which have low cost packs and offers as compared to airtel .i live in punjab region and many of us get full talktime offer starting from just rs40 so its an affordable sim for calling and also for those who use internet data because its 2g internet starts from rs99 which is best price as compared to other operators.its speed is quite good and I recommed this for you because for other operators you hav to pay higher charges and I request you to port your number from other operator to vodafone so that you can save your money and also you will get aa better experience for their services. Keep supporting vodafone