Difference between 2g sim and 3g sim cards
Main difference between these two are memory size. 2g sim cards has only 32KB of memory but 3g sim has 128KB. So it can handle more speed.
2g sim transfers data from 56kb to 236 kbps, but a 3g sim handles upto 21 mbps data p/s. So video calls,live tv options can be used.