Originally Posted by
pdxer
in addition to fring, there are two more voip apps: pennytel and truphone.
I've used Truphone (a UK based company) while travelng in Canada, Argentina, and the UK to make calls back to the US and it worked really well.
Interface was great and the best part is your calls show up with your original number on the caller ID so people know who is calling.
I recommend it.