I have the I300 I bought Off ebay. I have a kyocera 7135 (on verizon) can the Sprint I300 be unlocked to work on Verizon and if so does it have to be activated with Verizon before you can unlock it. If so how do you go about unlocking it. Thanks

P. S. The screen has a light or yellow spot in the center of the screen, what causes this, is it general use.