My experience with Onesimcard.

[Grampa]

Originally Posted by OneSimCard

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.

I don't know whether you are being facetious, but I'm having a hard time getting my head around what you said. Who would buy a card with the express purpose of seeing how long he can make it last without using it?

My only point is that the combination of a 10 month expiration period and a $25 minimum recharge amount means that, as a practical matter, someone who is not traveling all the time will leave money on the table. It's hard to finish a trip without leaving a substantial balance in the account, and if you don't need to replenish that amount for a while, you will lose it.