The money on your balance never expires.
Yes. We charge you for every message that was sent on your behalf. We can’t pre-evaluate your list of subscribers. Theoretically you could have a list where a half of the phone numbers don’t function anymore, but usually our customers regularly “clean” their lists so that most messages reach their recipients.
There is also a slight possibility that for some reason we cannot confirm delivery to a subscriber, although the message was delivered.
However, we can meet the wishes of our regular customers with high-quality lists and charge them only for delivered SMSs.