Okay so. When I pressed the home button to turn the phone on, nothing happened so I just assumed that it was doing what it does sometimes - randomly get turned off, requiring me to restart it by pressing the Home and Lock buttons simultaneously for about 10 seconds. So I did that. But nothing happened. I tried again. No go. I plugged it into the wall charger then, but still nothing happened. A friend of mine informed me that when he tried to call the phone rang, which is weird because I did not hear it ring, neither did it light up - it simply did nothing. Now it's been an hour and I tried to start it up again using the lock-and-home-button method but that still won't work. Connecting the phone to my computer via USB cable won't work either; the computer won't acknowledge that the device has been plugged in and nothing shows up on iTunes either. So now I've just left it sitting there. I took the SIM out. I don't know what to do.
Anyway, details of my phone - it's about 3 months old, non-jailbroken. It fell yesterday; I remember that, but it was a small fall and it had its case on at the time and it worked smoothly all throughout the rest of yesterday from when it fell until today when it randomly got turned off. Another thing - it does the random turning-off thing quite often, the thing that requires me to restart it using the lock and home buttons. I guess that might be relevant, although like I said, that method is not doing anything right now.
Please tell me what I can do. This is highly inconvenient and irritating.