Chosen Solution

I was using my phone on the bus today and the phone suddenly flicked off/ After a few mins, I felt that my phone was getting warm, so I took the phone case off the phone and the phone was HOT. After I cooled down the phone, the phone wont turn back on. I tried tutorials online (force restarting the Iphone, Clean the Iphone or rebooting the iphone, connecting it to itunes on my computer etc. )Please help

The only thing you could try would be replacing the battery but by the sound of it I don’t think this will bring your phone back to life.  This will more than likely be a board fault. There are many components on the board that can cause this issue if they become faulty and without the right equipment and knowledge I am afraid there is not much you can do except have it repaired by a reputable repairer.