iPhone as a Green Technology?

Cristin's phone's battery life had declined to about zilch recently, and we needed to get her a new battery at least, or possibly a new phone. So, we sprung for the iPhone. I had been hanging back to see what Google would announce, but the final announcement indicated that seeing a real phone might be as much as a year away, too long to wait.

After having played with this thing a little bit, I now realize that it might actually save me energy and hence be a mildly green technology. It is a stretch, but bear with me: Mainly, I turn on my computer in the morning to check my email. This is a several hundred watt computer, and all I want to do is see if there are any new emails, usually no. Now, I no longer need to turn on the PC, I can check reasonably well from the phone. Similarly if I just want to look up a phone number, address, etc on the net, I needn't necessarily turn on the PC.