I have a Samsung S4 mini which I have had for nearly 2 years. It has recently become slower but still usable. I was messaging a friend last night through Whatsap and it was fine. When I woke up this morning the phone had turned off and will not turn back on or charge up. Today I borrowed a phone from someone, also a Samsung Galazy something, to tide me over until I get an upgrade. I have inserted my sim card and was using google maps when the phone turned off and will now not turn on either or charge up just like before. Is it possible to have a virus on my SIM card that keeps killing my phones? I have used a high speed charger that came with my husband's phone (also a Samsung but a newer model) a couple of times over the past few days but both phones worked since using this. Could it have been this charger that fried the batteries? I need some advice so I don't keep braking future phones. Many thanks