I have been using WP for a couple of months now but yet to test...

I have been using WP for a couple of months now but yet to test it while travelling overseas. Hopefully going to Philippines in July.
So far the calls I have made to overseas countries and within Aust have been great in comparison to the full VOIP apps. I have had issues in losing credit / minutes which is usually during upgrade of software, but the tech support guys were pretty quick in responding to that and getting my credit back, usually with extra credit too.
A good chunk of my portfolio is invested in these guys.