Santa Sardar and Banta Sardar Funny SMS, Funny Sardar SMS

Santa sardar and banta sardar was talking two each other. Santa sardar asks banta sardar - What is diffrence between
1. Girlfriend
2. Lover
3. Wife
4. Stepny

Banta sardar said that the answer is very very simple
1. Prepaid
2. Lifetime
3. Postpaid
4. Coinbooth