Do minutes on China SIM card of a prepaid phone expire?

If so, when?

Answer

If you do not recharge your China SIM card account within the initial activity period of 3 months, your China prepaid SIM card will expire and all remaining airtime credit will be forfeit. The service life of your China prepaid SIM card may be extended indefinitely by purchasing and recharging airtime which, depending on their denomination, will provide a service life extension and all subsequent airtime credit will be carried over into the next validity period. For instance, USD 16.00 extends 6 months service life for SIM cards from Beijing, Guangzhou and Shanghai.