Grameenphone এর ডাটার মেয়াদ বাড়ান

Tricks Details: • Firstly you have to dial *111*6*6. • Then Switch off your phone for 15 minute. • Open the SIM and dial *500*1#. • Now wait few minute and then again dial *500*11*1#. • Now shut and re-open your phone and then check out the MB period is 30 days.     grameenphone

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