How often do you change cellphone numbers?

[MyWorld]

My wife has had the same number for close to 15 years now.

My number is around 8 years old.

 

[Shake&Bake]

Last 6 months have seen at least 3 changes as I've been bouncing between operators.

Might change again as I've lost my phone - but may just end up going for a sim swap.
Or might try CellC...