How to Send SMS Calendar Reminders to Invitees Through Google Calendar

Set Notifications
1. Log in to your Google Calendar.
2. Choose the calendar you want to enable notifications for and click 'settings.'
3. Click 'Mobile Setup' near the top of the page under 'Calendar Settings.'
4. Fill out the information on the next page. You will choose your country, enter your phone number and service provider. Google will send you a verification code on your phone to enter as well.
5. Click 'Finish Setup' when all fields have been filled in.
6. Fill in notification desires on the next screen. You can choose to be notified by email, SMS or both and set a time for how far in advance you want to receive a reminder. Click 'Save' to keep your preferences. You are now set up for SMS notifications.
Send SMS Reminder
7. Create an event. You can send out reminders only for an event you created.
8. Fill in your event details as desired. About halfway down the page is a section where you can fill in information on how to send out reminders.
9. Choose 'SMS' from the first drop down box. Input a number into the second box.
10. Choose whether you want the reminder sent out a certain number of minutes, hours, days or weeks in advance. You can add additional reminders if you need to send out more than one.
11. Click 'Save.' Any attendees to the event, including yourself, will now get a SMS reminder at the time you set.