Things to know about 4G networks
currently, operators have implemented the program to exchange 4g sim for free. so what is 4g network and what's different from 2g and 3g?
Tags : sim 4g viettel
How to register for 4G sim student package Viettel, Mobifone and Vinaphone
4g package for student sim of all 3 operators viettel, mobifone and vinaphone has great deals, to surf the internet, play games, access facebook, ...