Johnny6 is the household assistant service operated by Nick & Haley (Nick Bartz, sole proprietor). It sends SMS from (443) 450-9872 only to subscribers who opted in themselves, in one of the two ways shown below. The screenshots are of the live Johnny6 iPhone app with the subscriber's number redacted.
Settings, Text messages. The subscriber sees their mobile number, ticks the consent box (unchecked by default), ticks the box acknowledging the Privacy Policy and Terms and Conditions linked beneath it, and taps "Turn on text messages". The button stays disabled until both boxes are ticked.
After tapping the button:
They then receive this confirmation text:
The number (443) 450-9872 and the START keyword are shown to subscribers in the app, in the footer under Text messages ("You can also text START to (443) 450-9872 and reply Y to the welcome message"), and on this page. The exact exchange:
A number that is not a registered subscriber receives: Johnny6: This number only texts members of one household. Nothing has been set up for you and you will not receive further messages.
Reminders they set, confirmations of things they asked for, and answers to their questions, for example Johnny6: Hi [Name], reminder you set: [event] at [time] today. Reply STOP to opt out. Message frequency varies. No marketing, no third-party content. Nobody is enrolled by another person.