Hi,
I'm using FreePhoneLine for nearly 3 years now, and basically, I'm an happy customer! We had some problem with the service not always working in the first few month, but it will be nearly two years without any problem! Soud quality is great, you couldn't tell it's a VOIP or a normal land line.
But still, I can't recommend FreePhoneLine to the people around me, because if it wasn't of Fongo behind, FreePhoneLine always seems to go bankrupt. The Website seems really old and it is not updated : the website still advertise multi-line coming in 2013! And the design just seems really old.
Actually, since I subscribe to FreePhoneLine, I set up to others VOIP, but with another company. First time, it was because I just couldn't port my number to FreePhoneLine (http://forum.fongo.com/viewtopic.php?f=8&t=7544&p=41176&hilit=nlemay#p41176) and the second time, it was for a business, so with FPL still looking to close soon, loosing my number would have been a huge problem.
I just added credits to my account this morning, and the user panel also need an upgrade! Example : you can only add 5$ at a time, if you want to add more, you have to write an email... I wanted to add 10, but it was too complicated, so I just added 5$.
I guess that Fongo doesn't want to invest on FPL as it is not where they make the more money. But Fongo service, at 5$ per month, isn't the best deal on the market. They could do something really great with FPL if they invest a little bit.