I have tried a couple different formats, +1-xxx-xxx-xxxx I get a robot lady telling me please try again from that 0537 number. Possibly a Google robot eh? Like you get on your 4th conclusion.

As you say skype is not good for both in and out calls, probably I won't insist further on setting it up. I was once thinking to get a Skype number but now you said the quality is bad.

Someone suggested me trying www.diamondcard.us That same person was saying the quality of calls varies on this one as well. However not tested personally, from their website it is much cheaper than Skype minutes.