Charging a cell phone with a 6-volt battery can be done, but it depends on the power requirement of the phone. Cell phones come with a wide range of power requirements. Some phones use 3.6 volts, 5.0 volts or more. A 6-volt battery is best suited for a cell phone requiring 5.0 volts. This minimizes the number of extra electronic components needed to connect the battery and the cell phone. Use the old cell phone charger for parts.
