Please add the schema into the button you create.
Schema - tel:
Purpose - Call someone
Example - tel:0430381102
Schema - sms:
Purpose - Send an sms message to someone
Example 1 (empty message) - sms:0430381102
Example 2 (with a message)
sms:0430381102?&body=My Message
Schema - mailto:
Purpose - Send an e-mail to someone
Example - mailto:[email protected]?&subject=Hello Andre&body=Thanks Andre