At times when you are jail-breaking your friend’s iPhone or any else, you may be in a  situation  where you need to download the firmware for the iPhone but do not know whether it is a iPhone 3G or 3GS, here we are with a guide to identify it, just by looking at the model number.
It is fairly simple to identify a iPhone 2G
Here are some identification traits
– Silver back casting
– Metal back cover
– Memory capacity 2 GB, 4 GB, 8 GB and 16 GB
– Â iPhone 2G: A1203 Â (look for this number at the back of your iPhone)
iPhone 3G and 3Gs look the same, but there are some differences
Similarities:
– Hard plastic back casing with avail colors ( black and white )
Differences:
iPhone 3G
– Memory capacity 8 GB and 16 GB only
– Â iPhone 3G: A1241 Â (look for this number at the back of your iPhone)
– Gray writing (on back) = 3G
iPhone 3GS
– Memory capacity 8GB, 16GB and 32 GB
– Comes with 3.0+ version
– Â iPhone 3GS: A1303(look for this number at the back of your iPhone)
– Silver writing (on back) = 3GS
Also 3GS has a standard video feature and 3G hasn’t. Also there is a Standard Auto-focus feature on the iPhone 3GS which isn’t available on the 3G.
If you require all model information then refer below given table.
| Model | Year Introduced | Model Number | Capacity |
| iPhone 4 (CDMA model) | 2011 | A1349 | 16 and 32 GB |
| iPhone 4 (GSM model) | 2010 | A1332 | 16 and 32 GB |
| iPhone 3GS (China) | 2009 | A1325 | 16 and 32 GB |
| iPhone 3GS | 2009 | A1303 | 16 and 32 GB |
| iPhone 3G (China) | 2009 | A1324 | 8 and 16 GB |
| iPhone 3G | 2008 | A1241 | 8 and 16 GB |
| iPhone | 2007 | A1203 | 4, 8, and 16 GB |
Well there is another thing that needs to be considered, if it is factory unlocked or not, here is the guide to find if the iPhone is factory unlocked or Software Unlock
If you require any more information feel free to contact us here or on facebook
The DNetWorks Team