In short, no but we do use your data plan. Connect to wifi to avoid charges.
As an organizer, you can use Hustle from your smartphone or tablet as long as you have the app and can connect to the internet.
Everyone you text will receive SMS however, and this may count against their texting plan. Keeping your messages short and friendly will go a long way to reducing this impact.
Check out our Tips for Hustlers for our best practices to help you craft great messages every time.