Hello Werner,
Many Thanks
We have new phones & sims which currently work, and I'm installing AVAST Mobile.
We are migrating only the number from old provider.
The new phones/sims have a temporary number.
We call new provider with a Code provided by existing provider
We give the code to New Provider, and then within a period of time the old phone/sim/number is de-activated,
and the number moves across to the new phone/sim.
Hope this makes sense.?
Regards - David