provided by Star2Billing S.L.

Does the same account allow for simultaneous calls?
Yes. Here's how it works: Say you have a balance of ten (10) dollars. When your first call comes in, two hours worth of credit is temporarily frozen. So, if you are calling a destination that costs 2 cents a minute, that means $2.40 (2 cents/min x 120 minutes) has been frozen in your account. This leaves $7.60 available for another simultaneous call. When that second call comes in, more of your balance is frozen. You can keep making simultaneous calls so long as your effective balance is above zero. When calls are completed, the balance that was frozen is released and once again available for use. If you have a low balance, there's no sense in letting many simultaneous calls go through, only to have them all disconnect at the same time when your balance hits zero (what most carriers do).