Crypton.sh

Crypton is a phone-number service that has been running since 2017: long-term numbers for calls and SMS, short-term ones for a single verification, a travel eSIM, and e-mail aliases. No name, no email, no ID at signup — you get an account identifier and that's it.

What you get. The long-term numbers are the useful part: one number you can keep, renew and use across services, rather than a pool number that disappears after a code. The eSIM starts around €5 a month and gets cheaper the longer you keep the line. Newer additions include iMessage lines ("Blue Relay"), a bring-your-own-SIM mode for people who want to host their own SIMs, and an API.

Paying. Monero is accepted alongside Bitcoin and other coins, and there's an onion mirror. Cards and bank transfers are also offered, which are not private payments — pay in XMR if that matters.

The operator is named. Crypton is run by Rinzler Labs, a Scottish company with a registered number and an ICO data-protection registration, and it publishes a privacy policy that says what it stores and for how long. That's unusual in this category and it helps if something goes wrong, though it also means a legal entity exists behind the service.

Keep in mind. Number pools are still numbers: anything you tie to a rented number can be lost when you stop renewing, and short-term verification numbers go back into circulation. Keep long-lived accounts on a number you control and renew it.