Yes. Sending a quote via SMS is possible by going to Accounts > Quotes > select the Send / Share icon at the right end of the Quote.
You can do the same from within the Quote itself, by selecting the Share button at the bottom of the Quote.
Both of these options will bring out a drawer from the right side of the screen, where you can select the contact, the sharing method and edit any messages that go along with the Quote.
First you will need to get the link for the Quote, you can do this by selecting the Link option, and then select Copy Link:
To then send an SMS, select Send option from the top, and then Message from the next set of tabs. Within the body of the message, you can paste the link using Ctrl + V wherever in the message you would like it to appear. You can fill in other relevant information by using Placeholders (Ctrl + Space). And then Send the SMS.
Please note: In order to use the SMS features, you will need to have SMS enabled for your Formitize account, and have SMS credit in your account.