being without one's cellular device for an extended period of time

Without a phone

Also playfully or seriously known as a loser. When a person has no cell phone. That's it. Either they are too cheap to buy their own or their parents are too cheap to pay for it.

*NOTE* It is extremely embarrassing to date someone who is cell phoneless because then you must call their home phone and endure their parents/siblings/other live in's answering the phone.