Nomophobia is a noun that refers to the fear of being without a cell phone. 

Our word of the day is a recent addition to the English language that gets its origin from the words ‘no moble phone’ as well as the Greek suffix P-H-O-B-I-A which refers to an all-consuming fear of. Here’s an example of nomophobia in use:

While camping in the woods, I often feel overcome with a sense of nomophobia. But that feeling fades in the middle of a spooky ghost story told around the campfire. At moments like that, the last thing you want is a scary buzz of your iPhone.