Add the mobile telephone when you book the appointment in Google Calendar. The SMS will be sent automatically at the predetermined hours before (usually 24hrs).
The usual SMS message length is 160 characters but your messages can be up to 320 characters.
Ability to connect a foreign language message to a calendar. This way your clients can be informed in their native language.
Your team can start sending messages to their clients without a new account. Just include each team member to the main account.
It is very easy to get started: First authorise your calendar, then create your message and finally connect the calendar to the message. Nothing else needs to be done.