Is jailbreaking my iPhone safe?

I had a jailbroken 4th gen iPod Touch for 3 years, and I loved it. But after iOS 6 came and I jailbroke it again, it was super slow and glitchy. I'm not sure if this was because of the jailbreak, or my iPod was just getting old and out of date. I'm afraid if I jailbreak my iPhone, it will ruin it by slowing it down and making it glitchy like my old iPod Touch. Will it slow down, or can the A6 processor perform flawlessly with the jailbreak? I most likely will not be using it for themes.

Which phone I should buy HTC one or iphone 5s?

I currently have iphone 4, It has some hardware problem which can't be solved.
I want to buy a new phone and iim just so confused which one to buy?
I will have to wait a lot for iphone 5s and it will also cost 50k but i like iphone.
I just want to buy a new phone so i thought may be this time i shud buy android.
But IIm still confused about it which will be a better option.
also these android phones lose their reselling value so quickly. And today you buy a phone next day another powerful phone is launched.

Iphone 3gs home button unresponsive?

My iphone 3gs home button will not take me back to my home screen however when i hold it down, the phone vibrates. I have tried resetting the device.

PC 'Parameter is incorrect'?

All I want to do is backup my photos from my iPhone onto my computer… So I go into my computer once I have connected my phone to it and copy the photos… Go to my pictures and paste… It gets half way through and it just says 'parameter is incorrect'… What does that mean and how can I fix it! I have tried about 5 times now in different locations too and it only says that so does anybody know how I can fix this problem?

Thanks!

Added (1). This is my home laptop… I'm the administrator… It is Windows 8 HP. I'm no whiz at computers so please don't answer in gibberish

How to get Internet on iPhone 4S?

Stupid question I know. I know you can put Wi-Fi on, but how do you get it on altogether, once you have topped your phone up? Does come on automatically or is there a number you have to text or ring? I'm on T-Mobile btw. No longer on contract either. Hope someone can help.