FWIW, Blue Boxing does still work... but you need find a country that is still using old switches. You call the international operator, ask for an operator in country X (used to be Turkey btw I think), and then blast your tones and grab the trunk, then dial out using MF tones.
If you try all of the small countries you eventually will find one
I did lots of hacking on my Amiga 500 and 1200. Anyone ever used tymnet and sprintnet (X25) to get to QSD and Lutz in the 90s?
I can't believe I still remember this:
Lutz: 26245400080177
QSD: 0208057040540