SMS reminder setupSMS reminders are sent by Google Calendar, not by CalenGoo. CalenGoo just saves the reminder into the event, but the SMS is sent by Google Calendar afterward.
So to be able to use SMS reminders you have to configure them in Google Calendar first. Please sign in to Google Calendar:
and click the gear icon in the upper right corner, “Calendar settings”:
Then click “Mobile Setup” and enter your country and phone number. Click “Send Verification Code” to send a verification code by SMS to your phone. Enter the code in the “Verification code” field and click “Finish setup”. Click “Save” afterward:
Then you should be able to use SMS reminders in your events.
If there is a SMS reminder configured but you didn’t get a SMS, please try the suggestions here:
If this doesn’t help, report this problem to Google here: