I-Phone 6S

I-phone 6 S

Apple announced the next versions of its best-selling smartphones, the iPhone 6S and 6S Plus, at its annual launch event in San Francisco. Also as we expected, the iPhone 6S looks identical to last year's 4.7-inch iPhone 6, reserving its most  important changes for the hardware interior.

The biggest, and most noticeable change to this year's set of phones is "3D Touch," a pressure-sensitive display technology that lets you push in to do new things on your phone. After getting a chance to check out the new iPhone 6S and 6S Plus briefly at Apple's San Francisco event, these were our impressions.

Apple says that its phone may look the same as last year's model, but its iPhone 6S duo has achieved more inner strength. This time it uses a different grade of aluminum for its chassis, one that's also used in the aerospace industry. They call it Series 7,000, and it's the same aluminum alloy Apple puts into its Apple Watch Sport. The company clearly hopes this reinforced material will help deflect against future "Bendgate" backlashes, where some customers complained that their 5.5-inch iPhone 6S phones "bent" after being sat on.

Apparently, a new type of chemically strengthened glass also tops the iPhone 6S, though the company hasn't confirmed if this is cover material from Corning's Gorilla Glass line or not.