We can chat with our friends on internet and just need pay the net fee. Now we can visit internet by mobile phone, why should not we chat with friends on phone and use internet..Then we dont need pay the fee for every second. We just need pay the wireless fee.
Now google develop the open source system --Android.. May be we can try this.
Building a software like MSN ,QQ or OICQ, then we can chat to friends and see each other on the video .