How to prevent my iPhone 3GS from crashing or getting warm?

My phone crashed a few times before and i don't wanna take that risk again as i don't know that much about iPhones and i worry too much. So i started to decrease the times i use the internet on my phone but it still gets warm in just minutes when i'm on it! And don't laugh but i don't know what the hell is Cydia either nor what it does because I'm not currently living in the states so my dad said i can't upgrade it but my phone is jailbroken though.

Just *** it

  • Why does my Iphone 4S get warm and eat battery? So I got my new phone a few days ago and can't help but notice that it gets pretty warm after about 20 minutes of using facebook and the app store. I'm also losing 1% battery every 3-4 minutes while using it. Is this normal? I have tried turning off 'locations' on most apps and left it on for weather etc. Removed my icloud account but it still gets quite warm. Concerned it will damage the phone, thanks for any input!
  • My iphone 4 got wet but is still warm/hot and won't turn on what do i do? My brother dropped it in the toilet and i don't know how long i was in there i don't know how to get my battery out but it is very weird cause it is still warm and kinda hot
  • Is it normal for my iphone 4 to get warm? I bought a used iphone 4 and when i use apps and internet non stop for like a hour it gets warm to the touch and when it charges does yours do this
  • How to prevent my iphone 4 from constantly crashing? My iphone keeps crashing and it's beginning to prevent me from waking up on time, I have iOS 7.1.2 I think and it only started happening last week, any way to fix this?