Best app for free wifi calls??

Talkatone if you have a google voice number (free)

talkatone and magicjack are the best i found so far

FaceTime.

MagicJack & Vonage

Another vote for Talkatone. Crap UI but the most stable/reliable voip app for me.

Viber and Vonage have worked great for me and my flight attendant girlfriend. Call from Hong Kong had great voice quality on both! Also enjoyed Tango for adding the video element.

i vote for Talkatone too... but you'll need a Google Voice number first.. it was pretty easy.

you can try a call bridge if it supports that country... there are free services available but not as easy to find.

talkatone

Viber is Viber to Viber only I think, no?

I've tried a bunch and the best one by far for me is Pinger; free Wifi calling and free SMS.

Honarble mention goes to Sidecar.

Another one to throw into the mix is Footalk - free calls to other users over WiFi. I've made a few calls on it, worth a look.