A new language is evolving to describe this new phone behaviour. So common is Phubbing (See defn below) today the You Tube clip I forgot my phone now has over 21 million hits.

I forgot my phone screen grab

Not having a phone in a social setting is equivalent to being the only sober person at the party.

Screen grab from Stopphubbing.com website

Phubbing is not the only word we need to describe the social impact of phones on human behaviour.  The following posts suggest a few more words we need to describe phone culture. If all else fails you might like to use the word:

Phwanker (n) Any idiot with a phone.