Do the text messages come from a fixed number for everyone, and is there a format for the text messages?

You receive a dedicated texting number for your study, it will be a local area code. The format will basically be the same because it's texting. 

 

"Are texts through all storylines sent to participants from the same number?"
Yes, all texts sent through Storylines in a Project come from the same dedicated texting number with a local area code. So, your participants will always see messages from a consistent number, making things super clear and easy for everyone involved.