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Re:Ask HN: What API do you wish you had while building your ... by amiller2571 on Tuesday July 11, 2017 @08:10AM (#14743448)
I think it would be ok as long as it didn't tell you what the person's new number is or who now owns <number> if it gets reassigned.
Re:Ask HN: What API do you wish you had while building your ... by reitanqild on Tuesday July 11, 2017 @02:36PM (#14746763)
Ok, then we agree :-)

We just wanted to know so that we wouldn't charge the new owner for things the old owner ordered etc.