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How to determine your firmware version
To determine which firmware(s) you have on your iPhone, press the Home button, then the Settings button, then press General, then press About. Look at the entry for "Version". It will have a number next to it and another number in parantheses. We're only concerned about the first two (or three) digit number. In my examples I have 3.0.1 firmware. So when you hear: Apple is releasing new firmware, that's the number they are talking about. There's another firmware number you should be aware of. This is the one that says "Modem Firmware". This is also referred to as baseband by us hackers/unlockers. Every time you update your firmware (i.e. 3.0), the modem firmware gets updated too (except for the 1st generation iPhone). While baseband updates are good for most iPhone users, they are usually bad for those who want to unlock their iPhones. But for now, do not concern yourself with this. The image below on the left is from a 1st generation iPhone. The image on the right is from a 3G iPhone. I have outlined in red, the two version numbers. The image below those is from a 3G S. 
If you have a new iPhone that hasn't been activated or modified, then this is what you must do to determine what firmware you have. If you see this image when you turn the iPhone on, then you have either 2.x, or 3.x firmware installed. 
There are only two other images that will be displayed when turning on an unactivated iPhone. The image on the left is associated with firmware 1.0, 1.0.1, 1.0.2 and 1.1.1. The image on the right is associated with firmware 1.1.2, 1.1.3, and 1.1.4 only. 
To further determine if you have 1.0, 1.0.1, 1.0.2 or 1.1.1 firmware there is one more thing that can easily be performed. At the main screen on the iPhone, slide the slider to access the emergency call panel. Enter *3001#12345#* and then press the Call button. 
You will now see this screen. Press the Versions menu. You'll see the infamous typo menu entry called Firware version. This is actually supposed to say firmware version. This particular firmware number refers to the modem version. 
Which version of the iPhone do you have?There are now three generations of iPhones:
The iPhones to the right are second generation models. They are distinguished by tapered ends at the top and bottom. The entire back of the phone is a black, or white plastic. 
Since the iPhone 3G S is the same form-factor as the 3G, the easiest way to differentiate it from the 3G is by looking at the home screen. Do you have an application named Compass in your lower right corner as seen in the example? This program is only included by default on the 3G S. Note: the icon, and program must look the same, as other compass programs do exist. 
Another way to check if you have an iPhone 3G S is by launching the Camera application. Do you see a slider in the bottom right corner of the application that toggles between still photos and video recording? If you do, then you have an iPhone 3G S. 
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