Not at all.
Jailbreaking breaks down any restrictions implemented by apple. Basically, all it does is allows third party apps to access the flash memory. It will not slow it down at all.
Your iPhone DOES NOT slow down when you jailbreak it.
Multitasking does not work on a iPhone 3G, You must Jailbreak your Phone to do that (Beaware that your phone would be very slow with Multitasking)
Us Jailbreak me on the iPhone 4 if you have the firmware 4.0
No but you can jailbreak an iphone or ipod touch but they each have different sites to jailbreak your ipod/iphone
Jailbreak your iPhone
You need to use the program RedSnOw to jailbreak an iPhone 5.
You need to use the program RedSnOw to jailbreak an iPhone 5.
There isn't a jailbreak for the iphone 4 yet, but there will be in the near future.
It is okay to jailbreak your iPhone 3g. The only downside to jailbreaking your iPhone is that you will loose your Apple warranty.
You can not get Siri if you jailbreak a iphone 4. In order to get Siri you have to download the app.
go to **1 to know about jailbreak.
you have to jailbreak it
When you jailbreak an iPhone cydia is installed and Apple limitations are removed from iOS. A tethered jailbreak means you will have to connect to computer everytime you want to start your iPhone. While in untethered you do not need to connect to computer.