Sales of Apple’s iPhone 4S topped 4 million in just 3 days following last month’s launch, and it’s still the must-have smartphone this winter.

Out of contract, the iPhone 4S will cost you £499 ($763), but it was revealed that the nuts, bolts and high-end circuitry inside cost far less – a total of £112.89 ($173).

Expert analysts from technology firm iSuppli have prized open the pristine casing and totted up the cost of each component of iPhone 4S.

Some are reassuringly expensive – the touchscreen and display unit cost £23 ($35) – but others are less confidence-inspiring.

Next time when you are cursing the battery life, remember it’s only worth £3.68 ($5.63).

According to expert analysts from iSuppli, the real cost of iPhone 4S is just $173

iPhone fails to fix battery problem despite rolling out software.

iPhone users have insisted that a new software which improves battery life is not working.

Apple said its iOS 5.0.1 software would get rid of a bug which causes the mobile phone to lose battery life faster but customer’s took to the company’s website to vent their frustrations.

iSuppli experts have prized open the pristine casing and totted up the cost of each component of iPhone 4S

One user said: “Updated about 1.5 hours ago, battery has drained 20 per cent then with no usage! This is awful!”

Another added: “Still draining the exact same rate. Unplugged with a full charge 2 1/2 hours ago, and already down to 80 per cent with light usage. Just lost 2 per cent during a 15 minute shower. I see no difference at all.”

The software was also mean to add things like multitasking gestures for the original iPad and better voice recognition for Australian user. But it was the battery problem people are most keen to get fixed.