I got simultaneously the best and worst idea for a future cell phone invention in a dream. It's called the SpiPhone. If you leave it somewhere in your house and you get a call, you don't have to go and pick it up. It transforms into a robot spider, crawls up the wall to the ceiling, positions itself over you and drops down on a thread of synthetic spider silk. when it arrives next to your head, it alerts you to your call by making a hissing sound. It's voice activated, so any sound you make (including a sudden scream of terror) tells it that you want to receive the call so it swings and detaches itself from its thread to latch onto your ear, sinking its fangs into your head to keep it in place (hands free!) while you make your phone call.
It also supports video calls, in which case it latches onto your face instead of your ear. This is also its morning wakeup alarm mode.