The iPhone's newest operating system will be released today (Wednesday June 17).
The update will introduce a raft of new features for users, including a search function that works across the whole phone, and the ability to download and watch films and TV programmes.
Internet tethering will allow customers to share their internet connection with your laptop, via Bluetooth or USB.
There will be a landscape virtual keyboard in some applications, and the ability to cut and paste text from application to application, and images from the web.
Voice-memos will enable users to record meetings or memos via the built-in microphone or the mic on the headset. Users will also be able to take a picture or a video while inside messages.
iPhone owners will be able to download the software from iTunes for free. iPod Touch users can get it for $9.95. The new iPhone 3GS will be out this Friday.