India, Sept. 10 -- Apple fans are no strangers to upgrades but every so often the company puts out something that actually feels different when you hold it. The iPhone Air was officially added to Apple's line-up this year and it has generated plenty of chatter for one main reason: it's thin. If you're the type who pays attention to the way your phone fits in your pocket or the curve in your palm, you might care about fractions of millimetres more than you'd like to admit.

Start with the basics. The iPhone Air is 0.22 inches thick, or just about 5.64 millimetres, according to Apple's official specifications. That's not just a small number. It's the slimmest iPhone the company has ever made, and it puts some clear distance between the Air ...