Deactivate "Zero rental plan" by dialing [*567# -> My Account -> Deactivate] or by calling Customer care and put the sim out of mobile for atleast 4 days OR put the sim in phones which doesn't have internet facility then after 1 or 2 days reinsert in your mobile and activate zero rental plan.
TRICK 2 [TESTED BY ME]:
Send a message for porting [ PORT urmobilenumber and send it to 1900 (Rs.1 deduct) ], after few hours you'll receive call from customer care office for asking why you're porting. Tell them that Facebook Free 30 MB offer is not working for you so thats why you're porting. So they will forward our complaint and within one or two day your sim will be unblocked for free internet.
TRICK 3 [TESTED]:
Activate Facebook pack of Rs. 3 and after usage call customer care and tell them that Free facebook offer of 30 MB is not working for you. So they will activate free host within 1 or 2 days.
TRICK 4 [MANY POSITIVE REVIEWS]:
Recharge with Rs. 25/35 net "card" and after its usage and expiry try to open free homepage.
TRICK 5 [RECENTLY WORKING FOR MANY]:
Send 'FUN' 'MMS' MO' to 54321.
After this recharge your Airtel Sim by "card recharge" (post recharge) of any internet plan. After recharging any plan switch off your phone for 5 minutes and restart and send an (empty) message to 121. Browse the remaining data and at the end ( when your net balance is less than 1 MB start browsing airtellive.com with default browser)
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