Help, I went to use my Vodafone smart V8, put my finger on the finger print thing and nothing happened. The screen has remained black and the other way in, the keypad didnt come on. Thinking the battery could be flat i plugged in charger and a white battery picture came up that said 66%. I rang my ph from the landline and it didnt ring. On my landline the voicemail came on though. Any ideas?