Why? Well, because I got myself into a dumb situation with SIMs expiring.

I have 2 N900s with 2 phone numbers and a whatsapp from a 3rd phone number which doesn't exist any more, and I want to port the 2nd number to a 4th number, so I thought I could get 1 more year of free whatsapp from the 4th number which will only be usable for a few days.

And one of my N900s is slightly broken so it stays at home as my "landline", but it has the wrong whatsapp account activated, so it would be more convenient if I could move the yappari.conf, anyway I dunno I will just try it and see what happens.