To change the sim card on your iPhone simply open it at the back remove the battery and replace your sim card.
By knowing my phone number. Then by using a phone to call me.
If you never enabled Find My Iphone and want to try to track your iphone using IMEI number this website can do that: iphonetrace.
yes jailbreaking your Iphone/Itouch will not ever break the devices. the only difference with jailbroken iphone is that you have access to "Cydia" which is an app store made for apps that are not allowed on the Apple App store. I highley suggest using GreenP0isen.
You may download games straight from your iPhone using the App Store. You may also download games from your computer using iTunes.
Scroll to settings and then account settings and click user name ;) hope this helps
iphone 4
Justin Bieber is currently using his New Iphone 5'
You have to use the web and do it you cant do it from the app.
as long as it has been under 30 days since you bought it
I am assuming you are asking if you can update the iPhone software from the device directly rather than using a computer. Unfortunately, no, you cannot. The iOS (software used by the iPhone) can only be updated by using iTunes on your PC or Mac. This is because your iPhone needs to be "backed up" before undergoing a change to the device's operating system. No worries, though. With the constant progressions in technology, I'm sure we'll be able to do this within a few years!
Install Cycorder, which is free, on your jailbroken iPhone 2G or iPhone 3G allow you to record video using your iPhone.
he has an iphone 4 and a blackberry