to use your voice control you hold down the squere button on the front of your iphone and once youve done that it will come up with voice control ask it anything u like
Hold down the Home Button to Launch Voice Control!
If you mean IPhone 4S the difference is that 4S has Siri, which is like a voice assistant on your phone.
Because the iPhone 3G was a old original iPhone that didn't have alot of things like voice control and video taking .the 3GS doesnt a front camera ethier it was envenomed when they made the 4/4s
The iphone 4 does have voice control. To activate it simply hold down the home button until you hear the tone.
No you both have to have an iphone 4 :)
yes
No, there is although an iPhone case for the 4 that has a keyboard that plugs and you can use.
The iphone 4s desigh as same as iphone 4, so you needn't worry about that ,my girl friend's iphone 4s use my iphone 4 case (buy form 708buy.com) all the time, I prove the iphone 4 case is fit to 4s
A 4g phone is a lot faster than a 3g and it's a lot clearer.
No. It is not possible to use 2 apple ID's simultaneously on apple iPhone 4.
Yes I Use it every day it is my lock screen on my Mac and IPhone 4
Dial your voicemail either from your handset or another telephone to listen to your messages.