Once a phone number opts in, the text message (SMS) will be sent from the number 87569. If the message is 160 characters or less, then the whole message is sent. If the message is longer than 160 characters then the first 130 characters are sent as a kind of preview, then the remaining 30 characters are a link that the recipient can tap on to view the rest of the message.
If a phone number has never been sent a message from our system before: The first 160 characters are sent using a 424 area code number. Then a second message from a 424 area code number is sent asking them to opt into future messages by replying YES.
At any time, someone can opt-in by texting YES to 87569.
If the recipient does not opt-in, they will not receive future messages.