How to buy 2GB 3G internet in Grameenphone @ 400 TK

In 512kbps Package : 
Price : BDT 400 
USSD : Dial *500*56#
OR
SMS 512 1GB to 5000

In 1Mbps Package : 
Price :  BDT 700
Dial *500*106#
OR
SMS 1000 1GB to 5000

Terms & conditions:

• To check remaining 3G data volume, dial *500*60# and to know the amount of used up volume dial *500*61#
• Speeds tiers refer to maximum ceiling of the respective speed tier. Average likely speed will depend on multiple factors such as handset used, website visited, distance from BTS etc.
• Extra usage fee of BDT 0.01/10KB applicable for volume based packs.
• To stop auto renewal feature, write “off” & send to 5000 number.