How long can my SMS message be?
Automated text messages and SMS marketing campaigns
Automated text messages such as appointment reminders or invoice notifications and campaign SMS are limited to 160 characters or 70 non-English characters. Please keep in mind that transactional text message notifications typically contain a link, which is about 20 characters long.
Direct Text Messaging
Two-way texting giving you a higher character limit for text messages you send directly to clients. You can send up to 550 characters English or non-English. This does not change the character limit for automated texts and SMS marketing campaigns.