How to splice cell phone charger?

I am trying to connect 2 cell phones to one charger. I'm not sure if the factory charger will produce enough current, but I know how to figure that out if I get an answer to this question: If I were to simply splice the two connectors that go to the phones together (red-red, black -black) would there be issues caused by the two being connected in parallel? I guess I could technically put them in series, but either way the thought remains on whether or not I need to use anything to "isolate" the phones from one another.?

110100101108 years ago
you dont have to isolate them from each other. if they get the right voltage thats ok dont connect in series (not to 2 X voltage either) dont overload the charger (it may overheat or give out wrong voltage)