Too user friendly?

Normally kids like to play with handphone but they don't like toy phone. They like the real phone. We gave 弟弟 old handphone which no longer function but he just play for short while.

Mommy sometimes allow 弟弟 to take her handphone as she thought 弟弟 doesn't know how to unlock. However I think mommy is wrong.

弟弟 put his thumb on the sliding bar....and few tries later, the phone is unlock and 弟弟 is opening the application. Besides, 弟弟 also knows that he need to press on the one-tap access button to turn on the screen to unlock.

Should I said that iPhone is too user friendly until a 17months old boy also know how to unlock and open the application?