Jailbreak older iPhone to use strictly as iPod Touch?

[edro]

If the iPhone 5 ever comes out, I would like to use my iPhone 3G as a media player/game players, etc.
What benefits would be had if I jailbroke it?
Can I get longer battery life? Quicker performance?
Or could I just disable all of the phone functions and get the same benefits?

It's pretty beat up so I doubt I could sell it for anything.

I am just rolling ideas around now.

Thanks!

Edit: After looking around, apparently you can just leave the old SIM card in and connect to iTunes and it will be equivalent to an iPod Touch from there on out.
http://support.apple.com/kb/HT3406

 

[alent1234]

i used to use a 3GS and a 3G as ipod touches and all you have to do is restore as new. no need to jailbreak.

only thing you get is themes

 

[Qbah]

The 3G model is anything but a good game device. Has the ancient ARM11 CPU and crappy GPU... Plus 128MB of RAM. It really is bad these days... For music? Sure. But I bet the new model will have crazy times for listening music (should easily last you a day). So not really worth it to keep two devices.

Just give it away to some young family member. At least you'll get a karma boost or something :awe:

 

[Oyeve]

Thats what I use my iphone4 for, just music games and camera. I got a tons of games.