Difference between oldest iphone and current iphone

iPhone

iPhone
This is the 1st generation of iphone. This iphone was introduced by Steve Jobs in 2007. The dimensions of this iphone was 115mm(H), 61mm(W), and 11.6mm(D). Its weight was 135g. It was using iOS 3.1.3 as operating system which was the latest software that time, introduced after a year. Their 1st software was iOS 2. CPU that iphone used was Samsung 32-bit 620MHz.  So from here we can see iphone using term business to business. Samsung create a CPU only for iphone. When we talk about display, it was using 3.4 inch screen and its pixel resolution was 320x480 and it's rear camera was 2.0MP.

iPhone 3G
When we talk about iphone 3G we couldn't see huge difference between iphone and iphone 3G.
the design was same and it was second generation of iphone. It's dimensions 115.5mm(H), 62.1mm(W) and 12.3mm(D) and it's weight 133g. It's operating system was iOS 4.2.1. when we talk about CPU it was just same with the previous iphone it was using Samsung 32-bit 620MHz. So overall the major difference is operating system it can support new update which is iOS 4.2.1.

iPhone 3GS
Again the design was same. The dimensions were same with iphone 3G and its weight was 135g.
it was using iOS6.1.6 as operating system. Apple add new hardware into this product which was system on chip which was Samsung S5PC100. It's CPU was 600 MHz ARM Cortex-A8 designed by ARM Holding.
Again Apple add another new hardware which was GPU. It's GPU was PowerVR SGX535. So its had better graphic system compare with the previous product.

iPhone 4

iPhone 4
Apple came out with new design for their new smartphone which was iphone 4. Its dimension was 115.2mm(H), 58.6mm(W) and 9.3mm(D). Its weight was 137g. Its original operating system wass iOS4 and it can also support the current software which is iOS7.1.Its display 3.5 inch and its resolution 960x640. Rear camera 5MP and it has front camera also with 0.3 MP. Apple came out with ints own system on chip which was Apple A4, but its CPU and GPU were still same with iphone 3GS. 

iPhone 4S
When we talk about iphone 4S it had similar look as iphone 4 even the dimension also same but its weight 140g. it's original operating system was i)S5 and it can support the current operating too which is iOS7.1. It was using Apple A5 as it's system on chip. It's CPU was 800 MHz dual-core ARM Cortex-A9 as it's new CPU and same goes to GPU, it used PowerVR SGX543MP2 as it's new GPU. For rear camera Apple was bought camera lense from Sony which was Sony IMX145,8 MP. 

iPhone 5

iPhone 5

Its dimensions 123.8mm(H), 58.6mm(W) and 7.6mm(D) with weight 112g. It's original operating system was iOS6.0 and it can support iOS7.1. Its system on chip was Apple A6. Its CPU was 1.3GHz with dual core and GPU was PowerVR SGX543MP3. Display was 4 inch with LED backlit IPS TFT LCD 1136x640. rear camera 8MP.

The iPhone 5S (left) and  iPhone 5C (right)

iPhone 5S

Its dimensions and weight was same with iPhone 5. Its operating system was iOS7.0 using system on chipe Apple A7 and M7, M7 was a motion coprocessor. CPU 1.3 GHz Dual core and GPU PowerVR G6430 (four cluster@200MHz). Its Display and camera was same as iphone 5.

iPhone 5C

Its dimensions 124.4mm(H), 59.3mm(W) and 8.97mm(D) and its weight 132g. Using iOS7.0 as a operating system. Its system on chip was same as iPhone 5. Even CPU and GPU also same as iphone and same goes to Display and Rear camera. 

So from here we can see Apple try their best to provide better product and always came out with new idea and new future to subtitude their product and always up to date. They realise utility of users, so to full fill the needs and wants they always research to develop a good product. Apple also doing corporation with other company or business to business for example for their 1st iphone they buy processor from Samsung and same goes to camera they buy camera from Sony for their iphone 4S.