Members never pay. The group pays 1.5¢ per text sent, and 1¢ per text once a group sends more than 5,000 in a month. Move the numbers to match your group.
One message to a group of 400 is 400 texts. That's the whole math. A school that sends three notices a day on school days sends about 26,000 texts a month, which is why the rate drops to a penny past 5,000.
Announcements only, so parents' replies go to the office and not to 400 phones. And a daily limit you set, so one busy day can't run past what you planned.
You load a balance up front and texts come off it. When it runs low, it refills from your card by the amount you chose. Want a number for your own school or shul? Email support@bunchtext.com.