Note: with this step you get double of any data bought.
Step1:you need to migrate to smarttrybe jr.
How to activate smarttrybe 
dial *121#,
Select what's new for me
Select smarttrybe jr
Then activate it,you would receive a welcome message

Subscribe for any mothly,weekly bundle by dialing *141# and select buy data,after successful purchase of data u would be given another extra data value of what u bought.
Let's say u bought 1.5gb,u wud be given another 1.5gb extra.

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