Skype on phone

I need some help here. I want a cellphone that will run the skype app over wifi. My father currently uses skype on the PC to talk to his relatives. The price should be as low as possible because he probably won't be using anything besides skype on it

P.S. What about dedicated skype phones? Are they any good? I am currently ordering stuff from the US, so if I can get anything cheap from there, that would be a bonus.

Skype is available on various mobile OS like iOS, Android, Symbian and some other as well.

If you have a phone from above, install Skype and you need nothing more.

Cheapest option would be a Symbian phone (E63,E71 etc) or a dead cheap Android phone like Ideos. Skype runs well on both.