Every 2 years until now. With these new prices, lack of solid trade in deals, I’ll go the other way and use my current phone for as many years as I can. If I’m spending a grand I’m buying a laptop. Makes more sense to me now to buy a MacBook, Mackbook Air, or MBP, and just get a cellular connection for it, store it in the car, etc. At that point I could switch to a flip phone and not care. My life doesn’t revolve around a phone. I’m not on it hours a day (unless I’m on phone calls) nor addicted to it using it at the gym, while driving a car, during movies at the theater, like I see people doing. I see so many completely addicted to their phones.