iphone 5 froze on the apple logo then turned off and won't turn back on.

Also for the first 15 minutes it was OFF, it was overheating. Kept getting hotter and hotter until it stopped and cooled back down. I have tried turning it back on, restarting it, plugging it into my computer, charging it with an outlet.

I turned it off in the first place because I wasn't receiving any reception. please help. I am traveling indefinitely in Indonesia and can't just go walk into an Apple store.

I have not updated to the latest software because the internet here is too slow to do so.

thanks in advance