Used to be a thing with O2 here in the UK. My iPhone 3G (so, 2009?) was affected so I had to install an app that allowed me to tether.
Apart from SMS Auth and occasionally a "NEW FIRE BUD 10/10 stardawg smoke ring me" messages, apart from those SMS is dead..You're right on the money with this comment, what a strange country they have over there..
Used to be a thing with O2 here in the UK. My iPhone 3G (so, 2009?) was affected so I had to install an app that allowed me to tether.