The iPhone 5s is indeed exactly the same size as the iPhone 5, so existing iPhone 5 cases will fit the new iPhone 5s. Of course, cases for the iPhone 5 and 5s won't fit the iPhone 5c, due to the latter's different dimensions and slightly different shape.
Beside this, which is best iPhone 5c or 5s?
Processor Speed: The 5S is Faster. The iPhone 5S has a faster processor than the 5C. The 5S sports an Apple A7 processor, while the heart of the 5C is an A6. The A7 is newer and more powerful than the A6, particularly because it's a 64-bit chip (the first in a smartphone).
Is the iPhone 5 and 5s the same?
The iPhone 5 and iPhone 5s share the same form factor and button placement, however there are design changes that could prevent an iPhone 5 case from being used on an iPhone 5s. Most notably, the camera and LED flash on the back of the iPhone 5s are different from the previous model.
Is iPhone 5c or 5s newest?
The iPhone 5S is often accused of being a bit of a weak upgrade over the old iPhone 5, but the new CPU is a serious improvement. This old processor is what is used in the iPhone 5C. The iPhone 5S processor is called the Apple A7 chip, the iPhone 5C's the A6 processor.