It wasn't that easy though, for my provider (Australia / Telstra) the phone number had changed back to a number that hasn't worked for years and the password was blank. I didn't know the correct number, so restored my v11 backup to a temp table and found that 125107 with password mnmail is what I was using.

I had previously had to edit the "_No EOT Tap" SMS script, but this change appeared to be still intact. Still does not seem to be an easy way to verify/edit SMS scripts and had to open the table with SQL Manager.

Might upset a few people if the SMS Provider table is overwritten by the upgrade and they have to setup all the country/provider again on all their alerts.