I got a 3GS on a two year contract in April last year. When the iPhone 4 was announced shortly afterwards, I kicked myself, then started reading tech news websites. I won't get caught like that again!
As to what to do with the 3GS... I really don't know. I currently work nights, inside telephone exchanges. I'm shortly going to be working days, outside, getting filthy climbing telephone poles and entering manholes. Last time I did that, I destroyed two basic Nokia phones. I would't want to get a shiny new iPhone 5 broken, so I might not buy one at all. I'll probably put the work phone in a draw, put the work sim in my 3GS, and maybe get an iPod Touch 3g 128GB.
As to what to do with the 3GS... I really don't know. I currently work nights, inside telephone exchanges. I'm shortly going to be working days, outside, getting filthy climbing telephone poles and entering manholes. Last time I did that, I destroyed two basic Nokia phones. I would't want to get a shiny new iPhone 5 broken, so I might not buy one at all. I'll probably put the work phone in a draw, put the work sim in my 3GS, and maybe get an iPod Touch 3g 128GB.