Nope, I read The Register (UK based) and they've had scandals from celebrities having their confidential SMS messages leaked; SMS spoofing; I think they even have SIM cloning going on every now and then in UK and some European countries. (since The Register is a tech site, my recollection is some carriers took technical measures to prevent these issues while quite a few didn't.)

I don't think it's a thing that happens that often in UK etc.; but, it doesn't happen that frequently in the US either. It's just a thing that can potentially happen.

SS7 is a global issue, and so is social engineering to get a number transferred or SIM card transferred.

https://hitcon.org/2015/CMT/download/day1-d-r0.pdf

Its also been a problem in Australia, Optus (2nd biggest teleco) used to allow number porting or activating sim against an existing account with a bare minimum of detail - Like a name, address and date of birth. If you had those details of a target you could clone their SIM and crack any SMS based MFA.

I don’t know about other parts, but here in France SMS is a shitshow. I regularly fail to receive them even though I know I have good reception.

This happened the other day while I was on a conference call with perfect audio and video using my phone’s mobile data.

A few weeks back, had some shop which sends out an SMS to inform you the job’s done tell me this is usually hit and miss when I complained about not hearing from them.

SMS is not E2E encrypted, so for all intents is just a plain text message that can/has been snooped. Might as well just send a plaintext emails as well.

Number transfers in other countries is also mostly just a question of a bit of social engineering.