I have an iPhone 6 and iPad Air 2. Handoff simply doesn't work. The feature is switched on in the settings of both devices but if I start an email, text message - whatever, nothing flashes up on the other device. Doesn't work and never has. Apple are really p'ing me off shouting oh so loud and proud about seamless feature integration and 'it just works'. No, it DOESN'T just work!!!!