4.5G is the most advanced technology which will provide you:
4.5G SIM allows you to access Robi 4.5G mobile network. With a normal SIM, you can use 2G and 3G network. With 4.5G SIM, you will be able to experience Robi’s #1 4.5G network in addition to 2G and 3G.
Grab your 4.5G sim from nearest Robi WIC or retail point.
Please dial *123*44# to find out if your SIM is 4.5G enabled or not.