As I search on google only Bitphone I was able to find as mentioned above already.
I would recommend just use Skype but buy Skype Gift Cards with Bitcoin online. I've been doing this for years and it's the best option in my opinion.
A quick google search will give you an idea where you can purchase gift cards with bitcoin.
This might be much better solution for what you are looking for, though be careful of what other sites offering, they might be scammers or not, so take your time to search first before purchasing any goods.