Each telephone number hosted in a
Voip.MS account has the option for per minute or flat rate calls.
I have only ever used per minute myself.
You can try adding a telephone number to your account to see what the rate would be.
Outbound and inbound calls are billed on per minute plan.
Here is one in California I found:
Per Minute Plan $0.85 per month, (Residential or Commercial use) $0.009 per minute
Monthly Flat Rate Plan
(Intended for residential use) $4.25 per Month, $0.00 per minute
2 Channels Setup Fee:$0.85
Billing Increment: not applicable
Channels: 2
up to 3500 INCOMING minutes per month
I believe that you can also do just outbound without a number but have to set your Caller-ID. That allows you to test things without having to spend that 50 cents to actually buy a number just to test.
You can change between flat rate and per minute or the other way.