How do you intercept someone else’s SMS?

I’d always been interested in how this might be done - Slate has a nice high-level writeup on some of the techniques that might be employed.

Along with commercial mobile phone spyware, predictions of mobile malware surges (was last year really ‘the year’ of mobile malware?), SMS phishing, the FBI being a little sneaky with mobile phone microphones and using mobile devices for banking, it seems that those raising the alarm on these threats early like F-Secure will look fairly wise in hindsight.