I had aircel connection recently I ported my mobile number to vodafone, their were a lot of problems like
coverage, even in Delhi I had problem of network! Horrible
they were charging 1 rupee per call
they have very cheap plans for calls and internet but trust me they are not worth .
they will give more data usage limit but their speed sucks!(Their max speed is like Airtel’s minimum speed)
vodafone has many offers that they give their users time to time.
the only time aircel cared for their customers is when they register for porting the number.
I now have a vodafone number which gives reliable and much cheaper service .