Whatsapp - using an old number, is it ok to use it?

A

AC Question

Whatsapp - using an old number

I am currently using the old number for my whatsapp although it is a number that I used only for a year and I will not use anymore for calls or Sms etc. because it was in a different country. I keep moving quite a lot. Should I always change my whatsapp number or it is ok to leave my old one (the one I won't use). I've heard that numbers that are not being used are later relocated to a new user by the phone company. Should I'll change the number then? Should I be worried?

Also another question. I want to temporarily use another phone for the whatsapp, if I open a new account for a new number can it be later changed to another account on the same phone (account of a different person)?
 

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