We use a site that routes calls thru Hong Kong to the RP, called Owtel. It's far from perfect, but at 21 cents a minute from cell to cell, it's about as good as we can get. My wife's made several calls already this AM--we're sending the whole family on a spree to Davao--to the malls--out to eat at Banoks and to see the 3 D movie 'Avatar'. They're so excited! We really had to drill into them to spend the money on FUN (not 'practical') things, finally conceding that getting some new pajamas for her parents could be a 'fun' thing to do.
Anyway--Owtel gives you thorough records for USCIS and if you have dropped calls or totally crappy connections for a few minute call, they take them off the bill if you take the time to call.
it's just nice to have those paper records for the USCIS along with your Yahoo archived chats, which you should be saving to print. I have used AT&T in the past--I think they were 23 cents a min last time, plus a $3.50 a month international charge, but the connection's are usually good. I was surprised their rates were so low-might be a bundle deal.
I think we're going to drop AT&T and my landline and just go with the Magic Jack and cell phones instead