Very happy with my Plusnet Broadband, they have a deal on mobile that would double the data and be slightly cheaper than GiffGaff. Sounds a no brainer.
Except that it turns out they do *not* support replying to short SMS messages. The argument is that this can help protect you from scams (even though one nice thing about Plusnet mobile is that you can set a cap on charges).
So when Barclaycard sends a "suspicious activity" SMS, you cannot reply to confirm or deny. Followed by best part of an hour to Barclaycard customer services in deepest asia (with a very thick accent, quite difficult to follow).
And the correct charges (PCN's run up by son when borrowing the van, but that's another story) still take more than a day to move from pending to paid.
LOADS of complaints going back four years on their community forum, apparently a lot of doctors' surgeries are using short SMS for covid related stuff.
So be warned!
\rant