Use a selectable voltage charger and adapters.

I have a charger with a switch on it that permits setting its output voltage. Coupled with a set of adapters available from Radio Schlock and other vendors, that permits a single inexpensive charger to power up virtually any phone so that its data can be removed. Just be sure that the charger is rated for adequate highest voltage and current. I find the adapter handy for a lot of things besides cell phones so its cost need not be thought of as lost after using it for the phone project.