I spilled mountain dew all over my apex and brought it to us cellular the guy looked it over told me i have 90 days to make a claim with the insurance company but he atleast made it so i could use the phone somewhat untill i get the $100 deductible. well anyways my point is once i brought the phone home and it died when i plugged it in and turned it on it has the words safe mode in the bottom left corner my question is why and what is it?