To enjoy unlimited gprs in aircel, do the following steps

1.Activate AIRCEL ONLINE (it's a free service with charges 10kb 10paise)
2.To activate aircel online, sms spacespacespace to 57788{toll free} (eg for nokia 6680 sms GPRS BP NOK 6680 to 57788(toll free))
3.After sms aircel office will be activated within 2hrs, To enjoy unlimited plan, do the following:

3 Days Plan:
step1: E-recharge your aircel sim with rs 14/-(fourteen rupees),when the moment you receive the "recharge successfull" message you can connect internet for free for 3day's.
Note : You will get a talktime of rupee 1 with this recharge.
You must have a minimum balance of rupee 1 to connect to internet.
For settings sms YESBP to 57788(toll free)

1week plan:
sms ERC29 for 1week UL gprs

One Month activation: E-recharge your aircel sim with rs 98/-(ninetyeight rupees),when the moment you receive the "recharge successfull" message you can connect internet for free, for one month.