Bitphone has been released! Place international calls with your Bitcoin or Altcoin. No need to register. Anonymous calls, use a custom caller Id and more!
Check it out:
https://bitphone.netNo doubt this is an advance website but unlike what you said registrations is needed, the $5 btc bonus is reasonable but I cannot ascertain the cost per minute though it appear cheap, so OP should try to include the call rates per country, it might help.
You don't have to register, just goto the phone and deposit bitcoin.. https://bitphone.net/Home/Phone
We encourage registration and offer cheaper rates for registered users..
Also, once you enter a number, the rate is displayed in both millibits and whatever currency you select.