I am using airtel 2g and 3g packs both according to my needs.it is expensive , they are giving 2g data card at rs 129 for 28 days which get finised at 25 days and 3g and 4g data card at 259 for 28 days which get finished of at 15 days only if you use minimum also and it can be more or less according to its use.but I am using this network data card inspite of so expensive because its very fast and service is good.it becomes reasonable sometimes when they give offers like recently they give offer on 3g , 4g pack of rs 153 for 28 days.but as I said inspite if being so expensive it is worth it.if you want good service and speed then switch on to airtel data pack.