Share MB extension system in GP SIM . . 3 Grameenphone * 566 * 13 #, * 566 * 10 # and * 566 * 26 # This package can easily extend the validity of the Internet. Grameenphone offers new internet for several days in a row but the validity of internet data cannot be extended. Today I will teach you how to extend the internet validity of * 566 * 13 #, * 566 * 10 # and * 566 * 26 # of these balances. 1. To extend the validity of * 566 * 13 # , apply 50 MB data from Grameenphone's Flexiplan for a period of 7 days. 2. To extend the validity of * 566 * 10 # * 5000 * 22 # 3. To extend the validity of * 566 * 26 # , purchase 50 MB of data from Grameenphone's Flexiplan for a period of 30 days. Note: Now the MB code of Flexi plan is different, if you take 20 MB , it can be seen in * 56 * 26 # and if you take 50 MB, it can be seen in * 56 * 13 # , so beware of GP trap.