Talk:Singapore/@comment-210.14.28.35-20150630160351/@comment-24682153-20150630204310

From SingTel:

The hi!Card must be topped up at least every XX days, otherwise, the hi!Card will be deactivated and any remaining value in the hi!Card will be forfeited. Top-Up cards also have an expiry date printed on their back. After expiry, the card is not valid and cannot be used.

XX days = number of days depend on your card (see starter pack in the article) and the last top-up amount and date. Can be 90-180 days. An old (expired) SIM card is shut off and can not be reactivated.