I have had this problem as well. The funny thing is I'm in grade 6 but I fixed it in a day! The problem probably occurred because water got inside your phone. The way to fix it is very simple. I'm sorry but it is way to late for you but this is for other people. First, as soon as the lines appear, put it in a airtight packet of dry, uncooked rice grains. Or in a packet of silica gels! This takes away the water drops out of the phone. Oh and don't forget to turn off your phone because it stops the water getting to the electronic components. Then after 12 hours take the phone out. Clean it with a small super dry paper towel or cloth. Then with your fist, slowly and without too much force bang the back of your phone. Then increase the force a little and bang the edges of the back. Then, bang the edges of the phone with the edges of a big and hard book, a big dictionary or just any big hard cover book. Then take a little vacuum cleaner and blow it front of the charging port. Not a dry cleaner mind you. Then take it up to the fan, a table fan or ceiling fan and hold it there for 10 minutes. Then, turn on the phone. If the lines do not disappear then bang the back more forcefully. If it doesn't I'm sorry but you need to take it to a Apple Store. If the lines disappear, then close the iPhone/iPod/iPad and keep it there overnight. By afternoon, the virus will be over!