Well, I finally sacked-off the 1pmobile sim card I’d installed in an old android phone. 2g isn’t quite as cutting edge as it one was 
Using the gmail/email driver, webcore and clicksend works wonderfully.
4p per sms. Topup only required once per year.
I would prefer a hubitat inc solution, and would be happy to redirect funds your way, but my spending would be negligable so I suspect this’ll remain a 3rd-party jobby.
Cheers all 