Gone are those dark times when you had to get a new number in order to switch to a different operator. As of yesterday (Dec 8), for a fee of B99, you can transfer your old number to a new service provider on the following conditions:

1) Prepaid customers have to register with their old network providers before the switch. Postpaid users have to ensure they have paid all their fees.

2) You must stay with the new operator for at least three months before making another change. The process will take three working days to complete.

3) Changes are limited to 500 numbers a day (100 for per each service providers: AIS, DTAC, True Move, TOT and CAT Telecom) at 25 designated service locations in Bangkok.