Skype
I used to be a huge fan of Skype.... until recently. I discovered that they will block your account if you use the service too much. I was up to about 100 to 125 Euros in SkypeOut calls per month (I was using it for both personal and business calls), and that triggered their "fraud detection" and they have blocked me from buying any more calling credit. They claim that they will release my account after an undetermined length of time... meanwhile I cannot top up my account... I can still use what remaining credit I have, and I can still make PC2PC calls. They have provided one last resort way to top up your account... Moneybrokers, but it's got to be the worst 3rd party secure payment service on the planet. I've registered with Moneybrokers in an attempt to top up my account, and I somehow managed to get a Moneybrokers account that does not allow me to add money in any way at all... and Moneybrokers will not respond to service requests. Keep this bizzare business practice in mind if you plan on using SkypeOut a lot. If you are a good customer, they will "punish" you. They are the only company I've ever dealt with that will initially accept your credit card (after verification), and then refuse your credit card after you've become an established and verified customer. It's a shame since Skype call-quality is second to none (at least to those that I've tried), and call charges are so low.