Potentially, an Android device could rely on TCP/IP for all
communications, including telephony. For consumers that could be a
great benefit. Today cell/mobile phone service providers charge a lot
of money for just the telephony service including SMS. In fact, they
make HUGE amounts of money on SMS messages alone. Imagine an e-mail
application where each e-mail was very limited and that you had to pay
for each e-mail you want to send. That's how SMS works today!

New technologies could bring very cost-effective wireless TCP/IP to
all people. Then the traditional type of cell/mobile phones would in
theory not be needed any more. Instead of phone numbers people could
have URLs to their Voice over IP accounts or both.

The same wireless TCP/IP that Android devices use can be used by
laptop computers and even stationary computers when (and if) wireless
TCP/IP will be able to compete not only with current cell/mobile phone
carrier technologies but also with ordinary cable Internet connections.