You would have a useless object that within a day is permanently discharged and turned off. Maybe you bring also a charger and luckily find a stable enough power source that it doesn’t burn in a few days.

Still, an iphone is a useless device without network of any kind.

Maybe you could impress somebody with the calculator (those existed already but where massive mechanical devices unable to do divisions without a math degree kind of).

My guess nobody would be quite interested. Probably the plastic and aluminum would be the most interesting technology for the time.