True story, this bit is what I’ve been working on for the past six months or so.
I may be wrong, but this seems to have unfortunately fallen between the cracks between Ofcom and the Financial Conduct Authority. In my opinion, all forms of carrier billing should be regulated by the FCA as a financial transaction but ultimately, Ofcom seems to control phone bills? Very messy either way.
Charities use them all the time for donations! That’s the main use of them in the UK nowadays, but they can also be used for carrier billing of digital content. Back in the day, this meant ringtones and wallpapers. They can also be used for pay to enter competitions and such.
Carrier billing in general (outside of paid SMSes themsevles) can be used with Google Play and the Apple App Store in limited situations, and in some countries that is pratically the only way of paying for things from these providers. Some online games (thinking League of Legends) also support phone carrier billing in certain countries.