An SMS is a text message which can be sent to other mobile phones. There are a couple of Chrome extensions that allow you to do the same from within the browser. One is Send Your Email to SMS (text). It was suggested to me by someone in the office as a reliable extension that makes short work of forwarding. It works best with Gmail and installs a button within Gmail that provides a popup window where you can add the cell number and the message to forward. To do this, how to forward an email in a text message you can go to the Reminders app on your phone, create a reminder to send that text, and put the text contents in the notes of that reminder. This is a fairly simple way to schedule the text, even if it isn’t automatic. For a phone number you can just list it and the iPhone detects and makes it a callable link. For iMessage you need the iMessage:// syntax for it to open on the mac.