Zoiper is not providing you with calling services (incoming, outgoing calls or numbers).
You will need to ask your VoIP provider about their rates instead.
In order to make calls with Zoiper, you need to connect it to your office PBX or sign up with a VoIP provider.
You can find a list with providers here:
Please note: Zoiper can be used with any SIP compliant provider, even if it is not listed on our provider list.
Zoiper supports balance display for providers who are on our list of pre-configured providers. You can find more info on our OEM page.