I would like to build the following service.
1. User texts a sign up message to a specific number / signs up on a website to be added to a group.
2. A payment is processed from a user to a paypal account (recurring monthly)
2. User is added to an SMS group
3. Group receives text messages from a central relay
4. Members of the group can send SMS to central number and that SMS gets approved and / or automatically relayed to all group members
5. members have ability to temporarily suspend or turn on and off the message feed by sending a short "on" or "off" message to the central number. if they turn off the message, whn they turn it back on they only get fresh messages, not old ones.
6. Individuals can cancel monthly payments and turn off service through text message service.