Phone is unresponsive

[fxc]

If you already followed fxc hint without success you cold try to charge battery with external charger. I could manage to charge many batteries using a voltage and current controlled power supply. If you choose 4.1V and 300-500mA values you should succeed in charging. If the phone won't start with battery charged there must be something broken on the phone.

Thanks for the suggestion. Is there a charger you can recommend? Cheaper the better. I'm working on a budget. ?

Mind that it is possible that the battery is completely flat, such batteries don't like getting fully drained. On the wiki there are some compatible batteries listed, which you can order from Amazon, Ebay etc., which might be worth a try.