You mention 5 activation modes — what are they?

The first and most common: conditional forwarding on your existing line, changing nothing. Then, unconditional forwarding if you want to hand everything over; a dedicated Signal number for a specific campaign or ad; the hosted voice platform when your phone system can route to an external number; and manual forwarding from your mobile to test under real conditions. The mode is chosen with you during activation based on your current setup, and it can change later — nothing is set in stone.