No South Korea nodes in Mullvad’s server list. Perhaps other providers do? I don’t think SK is a popular destination for exit nodes since it has a strong censorship against pornography among others.
I have been doing precisely that. You have your personal number and the secondary number that doesn’t have to be attached to your name if you want. Ofc law enforcement and telecom companies will be able to trace you based on cell tower locations and phone model.
Pro: An extra disposable number to give out whenever people ask you for “we need your phone number for ShittyDiscount”. Whenever the spam calls get annoying I simply pop it out and place another prepaid sim.
Con: Phones with dual sim support can be rarer to find and be more expensive depending on your country.
The consensus a few years ago in /r/privacy was that it’s too expensive and risky for smartphones to transmit audio data to their HQ, bandwidth constraints, processing power and capabilities considered.
Now… with higher specs and advances and optimizations in AI for audio transcription, would it be feasible to do all that spying but locally on the device itself? The device would transmit ‘daily reports’ after processing.
There’s an ISP level filter against pornography and North Korea related materials, but VPN uses are tolerated in South Korea as far as I’m concerned.