That did occur to me, so I only gave them my old number.

Yes, I’m aware of that, but being irrational alone is not sufficient. There are an infinite number of irrational base-10 numbers that only contain combinations of 0 and 1, for example, and none of them will contain my phone number, credit card, etc.

Not all irrational numbers are normal numbers, and only normal numbers are guaranteed to behave as described in the OP.

I thought pi hadn’t been proven to be normal, only conjectured to. My phone number isn’t in the digits of pi that we’ve discovered so far, for example: https://www.angio.net/pi/