If you're truly looking for no-code, check out:

  - ClickSendSMS (https://www.clicksend.com)
  - EZTexting (https://www.eztexting.com)

They also have Zapier integrations so you can do more no-code stuff.

Also, Zapier itself has a outgoing SMS offering (cannot receive sms messages) in case that's helpful as well.