Hi Blast,
Most cell phones can be powered from a single AA cell. The problem is that most phones require a 5-6 Volts input. This requires a switching voltage to voltage regulator, which takes the 1.2-1.5 volts of the AA cell and outputs 5 or 6 Volts.
The cell phone will then have a switching voltage to voltage regulator to convert the 5 or 6 volts down to 3.3 or 3.7 volts to power the phone and/or to recharge the Lithium ion cell in the phone.
What would be possible would be to just duct tape 4 AA cells together (gives 4.8 to 6 volts depending on the cell chemistry) end to end together with the two pieces of wire and then ensuring that the wire touches the correct power terminals on the phone. If your phone has a USB type power/data connector this would be more of a challenge.
If you're going to improvise something like this using bare wires get to know your hardware. Can your phone handle 6v? Is 4.8V enough? I'd rather have a phone with a dead battery than a battery with a dead phone.
Also don't forget that some phones require more complex hookups than just connecting the red and black wires. Motorola phones for example (new ones) use a USB plug but you have to short out certain pins inside the connector or the phone will ignore the power you're feeding it.
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