Now use Skype on any cell phone, courtesy MOBIVOX. This beta hosted service requires no downloads and works on any cell phone. You don't even need be near your computer to enjoy calls and it can be availed in twenty three countries. What else you can enjoy international fixed and mobile calls between MOBIVOX users for free. Just go through the list of features you can enjoy with MOBIVOX:

Cheap international calls to anyone, anywhere on any mobile or fixed phone
Unlimited and FREE Skype calls
Free global mobile calls between MOBIVOX users

It also offers some other free mobile services such as Mobile-to-home seamless call transfer, dynamic and instant conferencing, unified hosted contact book, personal voice-enabled assistant, web calling and group calling. What I liked about this service is that it is PC independent and works with any mobile carrier or handset or whether one has a particular data plan or not.