Is it fair to ask a student to pay yearly fee every time he/she changes division in school. In Airtel family plan, a child can opt to pay yearly rental. Every time you change parent, your one year rental gets lapsed and need to pay it again for an year. 

With Airtel corporate myplan family 299 or 499, you can add a child and pay an advance rent of 399 for one year. Even when moving across from one parent to another parent number within the same corporate in the same plan, you need to pay the whole year rent.