Talk:Singapore/@comment-27.145.93.86-20151110050005/@comment-24682153-20151110105516

HI. You are right, that it makes sense to add SIM card validity to the article. The start-up prices of Singaporean SIM cards are pretty high. So you might keep your SIM card for another visit. There is no difference in Singapore beween SIM card activity and the balance still valid. In other words, there is no grace period and your card will be discontinued when all balance validity is gone.

Singtel: different initial periods depending on starter pack, $28 and $50 packs give 180 days. Top-up at least $20 for another 180 days. Singtel sells validity extensions: $0.99 for 60 days and $1.40 for 90 days by *398#

Starhub: initial period 180 days, top-up at least $18 for another 180 days, check by *123#. Starhub doesn't have any other way to extend validity.

M1: initial period 180 days, top-ups only valid for max. of 50 days. M1 also sells validity extensions by dialing *100*6#. $2 for 60 days, $3 for 90 days and $4 for 120 days. In summer 2015 they ran a 50% discount promotion on extensions. But I can't tell you if it's still on.

Note: You can't always rely on that USSD codes work through roaming networks. If they don't, you need to call customer service in Singapore to have it done.