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Re:Show HN: Dtmf.io – virtual phone numbers from 50 countrie... by cr3ative on Monday February 03, 2020 @08:00AM (#22223726)
> it will never be used by anyone else after you

This isn't true; UK mobile numbers are re-used after a period of inactivity by the operator themselves.

Unless, of course, you're keeping the number/line live in permanence? But I can't see how your service would make that work financially.

Re:Show HN: Dtmf.io – virtual phone numbers from 50 countrie... by dtmf-io on Monday February 03, 2020 @08:11AM (#22223809)
If you re-read what I wrote, or perhaps quote the whole thing, you'll see that I was referring to the SIM, not to the phone number.

Of course unless phone numbers perpetually get longer, they have to eventually get re-used. We don't implement any re-use but the operator will indeed eventually recycle them.