Answer:
Other terms for this handy device include doohicky, doo-dad, and whatchyamacallit.
This is a dead giveaway
What has four fingers and a thumb but is not alive?
If you drive on this, pedestrians and the police will be pretty upset with you.
Prior to smartphones, people used this to record their lives.
People take me on walks and I run and have fun. What am I?