How to extend MB in GP SIM: Step 1: Dial * 5000 # Step 2: 8 ( Facebook Pack , Smart Plan 20 GB etc.) Step 3: 1 ( Social Pack). Step 4: 1 TK 1 for 1 MB , 2. 5 TK for 7 days , 3. 9TK for 14 days and 4. 15TK for 28 days. Step 5: Press Activate Answer 1 to auto renew . And 2 replies without auto renew . To extend your internet validity (MB Meyad) to 28 days , just dial code: * 5000 * 8 * 1 * 4 * 1 #. Then Grameenphone SIM will immediately extend the validity of your internet.