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1.
A place to go and smoke weed. Normally it is a semi-safe area where it is unlikely that you will get caught. The term is also used to designate a state of being really, really high.
"Hey man, you wanna go to the phone zone?"

"You guys in the phone zone?"

"I be just chillin in the phone zone"
by Mystic Treebeard November 22, 2009