SMS Button

<a href="sms:+1-4035550185"><embed src="https://dabuttonfactory.com/button.png?t=Send+Text+Message&f=Calibri-Bold&ts=24&tc=fff&tshs=1&tshc=000&hp=20&vp=8&c=5&bgt=gradient&bgc=3d85c6&ebgc=073763 "title="403-555-0185"</a>

The number in this example is a fake number that doesn't go anywhere.