My experience with Onesimcard.

[OneSimCard]

Originally Posted by Grampa

Thanks for the clarification. However, you can't make that call to yourself if the balance has expired, so in practice, the card will cost $25 every two years whether you use it or not. That's not a huge amount, but it does need to be taken into account when comparing offers or computing cost per minute.

Actually, you can purchase a $0 balance SIM card and then 23.9 months from now add $25 of airtime and make 1 call. So in this case, $25 would keep the SIM card active for 4 years/48 months if you do not make or receive any more calls or recharge your airtime. You would have until month 34 to recharge again and roll over the $25 balance, so technically it would not "cost" anything as long as you plan on using your airtime at some point.