Hi
I think that is most unfair to say. I have used
www.reallyjustdial.co.uk for some time now, and the rates are most competitive. The thing to remember is that going for cheap rates you are at risk of losing voice quality as well. I have experienced this in many of the companies that are offering cheap rates.
Secondly if I understand this correctly, price and access number change is due to the fact that the call has to be passed by carriers from country to country till it reaches its destinations, if its peak time for the carrier that is passing the call that carrier will charge higher than that carrier that is passing a call in its off peak time
In addition, there is also a difference in rates that varies for peak and off-peak for each carrier and hence the difference in price once all is calculated
You can see this variance if you check
www.reallyjustdial.co.uk, which I think still offers very competitive rates
Regards