How often you change your handphone?

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I often use a hand phone for years at least 2 years. It's very wasteful to keep on changing hand phone. The purposes I use hand phone are very simple,just receive/make phone calls and send/receive messages. That's nothing else I do with my hand phone. I am a bit slow in catching up with new gadgets and their functions. I would rather not to learn than crack my head to figure out how to use them. Maybe I am a lazy person. So how often you change your hand phone? What makes you change it? Because of trend,limited functions or something else? Do share with me.