[naasking]

Sounds like you could get a stable VoIP number and just use that. One time cost and has its uses for cheap long distance calling.

[Tijdreiziger]

Most people expect you to have 1 mobile phone number, not separate ones for calling and messaging.

[naasking]

I don't see the problem. Once you've registered with your messaging service, like WhatsApp, you're sending messages to people not numbers.

[Tijdreiziger]

Then if someone wants to call you, they won't be sure which number to use.