Etisalat freedata again...how to get it

This imei looks old but still blazing like mad....

>Tweak the imei below
861195004315640

>Note: Change the last 6 or 4 digits using imei analyser or calculator to get a valid imei

>Then Text T635 to 8186 to get your MB

You will receive this type of message
Dear customer,
"Your Bonus data account balance is 150 MB valid till 2016-02-06 00:00."

Get 2GB data for N2000.

Dial *229*2*8#.

Valid/30days.

For more info,dial *200#

Once you successfully tweak the imei and send the code, etisalat will automatically give you 150mb monthly for one year