Helppp my kin two m wont charge?

well i was in new york yesterday, and i plugged my phone into a wall socket of a basement bedroom i was staying in. this morning, i unplugged it and it was completely dead! when i got to the airport, i plugged it in to one of those terminal electric socket booths, and it refused to charge. i boarded my flight, and when i got back to LA, it STILL refuses to charge! i took out the battery and put it back in and all that, and it still wont charge. :PP anyone know whats going on??