How often you change your mobile?

I do buy new one from time to time like once every year. But I don't buy the expensive one. I like my mobile phone easy to use, convenient access to features and comfortable to hold. I don't mind if my mobile phone is the latest one or not either. Right now, I'm using 2 with different lines.

after a year or so...

depends on when my dad has money and when a cool mobile comes out ,ie the much better one that i have,about 7-8 months to 2 yrs are a lifespn of my mobile.

i dont change my phone often!i have a cdma (for internet) and a sony Ericsson's music phone!i love this because of its sound quality.the sound quality given by its earphone can be compared to an ipod one!(but ipod is best) here are some reasom i recommend sony ---because it is sony ---mobile can charged via usb like ipod!which is very helpful while browsing using gprs! ---software can easily update through internet all you have to need is a broadband internet connection! ---las but not least,of course its sound quality!