I’ve been getting questions from friends and family asking about using some older generation iPhones, esp with some of the deals that have been popping up lately. Specifically, they have been looking at the 5s, the SE, and the 6. I know the SE is still a current model, but it is getting long in the tooth and I wonder how long it will be around. So, what is the oldest generation iPhone you would recommend for a deal seeking friend/relative who just wants a phone that works and is not going to be useless for at least a couple of years?