Rebtel has been around for a while but no one has posted the 1 week free trial before. Only spotted it on MyDealz(German bargain site).
Your 30 day subscription will begin when your 7-day trial is complete.
You'll have to put a credit card to do the trial. It's $15 a month after that.
You can call 56 countries both mobile and landline (including Australia & NZ). No need for an Internet connection. The app (iOS and Android) gets your phone to dial a local number which then seemlessly connects you to the international number you are dialing. Alternatively, you can use the web interface to call the number you wish via calling a local number.
The MyDealz users reckon the voice quality is good. Also if you get any calls from Germans, you'll know why.
Damn no Philippines.