Hmm, I'm getting pretty worried about my iPhone 3Gs. It's generating quite alot of heat, so I was wondering, is it normal that iPhone generates that much heat? I understand that using any phone for a long time heat will definitely be generated but my iPhone is generating heat at a worrying level with just a short usage duration. Also, my phone is using a rubber-like full back casing which I purchased from Machines, could that be the problem? What worries me the most is that, back then, I came across a blog or article, saying that there is a case whereby a white iPhone went overheated and it somehow burned or something similiar to that and left some pink-like markings on the back of the phone cover. I've lost the link to the source and I don't know the reliability of that source which makes me worry even more.

Also, it seems like my iPhone battery duration is very very short. The battery level depletes very fast even when I'm not using it. The phone said that having 3G on will decrease the battery duration so I turned it off and yes I think I do notice slight changes but still not at an ideal level.

Lastly, I just got my iPhone from Maxis for about 3 days so my knowledge about iPhone is very limited, so please enlighten me. iPhone 3Gs do have bluetooth right? The bluetooth here ONLY refers to pairing with other devices which means I can't receive any files from other phones or send any files out? From my understanding, bluetooth enables user to transfer files across, so was wondering, is it my phone's problem or? I also went to look for alternatives to transfer files and I found Cydia. I know that in order to have Cydia working, I'll have to jailbreak my phone and Cydia works like an app store. In Cydia app store, there is an app which enables file transfering, right? I know my next question is a very preference base question, but do you all think Cydia is worth getting as I know by jailbreaking iPhones, it will void the waranty of the phone. Just wanna listen to some opinion. 

Alright, I guess that's all that I wanna ask. Thanks in advance!