Your plan indicates how many SMS messages you can send before you incur overage fees. Twilio (the SMS provider Customer.io uses) refers to these as Segments; we refer to them as Credits. Please refer to your order form for specifics on limits and overage fees.
Each SMS chat bubble, up to 160 characters, consumes a credit/segment. As you draft your message, we’ll show you how many credits your message consumes, so you know how much each message costs without having to count characters.
While each chat bubble can contain up to 160 characters, characters like emojis limit your messages to 70 characters. The Segments/Credits field updates as you type to show you what your message costs without having to count characters or learn about encoding schemes.
Be sure to also check out our article on SMS Best Practices!