Another variant using Skype is their [online number](http://www.skype.com/en/features/online-number/) service (formerly called “SkypeIn”). Unlike Skype's regular voice-over-IP service, there is a monthly fee but there are several advantages:

* Overall costs are still reasonable compared to traditional long-distance/international calls
* It's completely transparent to the caller, they just call something that looks like a regular local/national number, no computer is involved
* You pay for it, depending on their subscription it might even be completely free to them