Warning
please b carefull the trick is working mostly with all my friends... Just try! In case any lose i'm not responsible
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(1) you have to activate normal pack by dialing *567#
(2) after 1hour dial the same number and activate 10Rs rental plan.. Now you will b charged Rs 10
note carefully before it gets activated you have to sms MO to 56123
after it takes activation mobileoffice completly free for lifetime..