[from]

I consider it to be relatively harmless but how it is classified depends on the country. India is pretty cheap to call even absent simboxes but they still crack down on the practice for “national security reasons” because it makes tracking people more difficult. The UK (Ofcom) banned them outright for some reason a long time ago but that’s being appealed. In some African countries the laws are pretty vague and do not outright ban them, usually they charge people with “unregistered telecommunications business” or something like that.