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1.
Originally derived from the term used in a detention setting, like prison, when numerous individuals are made to share a limited number of telephones. When all the telephones are in use and another believes that it is his/her time to now take the opportunity to use the phone, and one of the individuals using the phone should end their call. In that case one would go to the the individual using the telephone and let them know that they need to relinquish (get off) the telephone by simpling stating the phrase "Phone check" and if that individual refuses then s/he could face repercussions(consequences) that come with the refusal, up to and including being murdered. A phone check itself is NOT a stabbing. A stabbing, beating, rape, or any violate act can be RESULT of a phone check.
"Phone check, homie", means get off the phone now!
by convict's girl November 19, 2009
 
2.
Where one stabs another with a sharp object (shank). Attacks often centered around obliques (lower front and back sides). Called this because supposedly people watching out for this type of attack would duct tape phonebooks around their abdomen.
Person: "So it was a failed rape?"
Witness: "Hell yea, Mrs. Johnson's 9 year old son came outta nowhere and phone checked his ass with a pencil."
by Luchidizzle September 27, 2004
 
3.
The process of reaching your left or right hand to your left or right pocket to check if your phone is there. People usually do this every 15 minutes, especially if they're sitting.

Becomes popular among people if they've lost a phone once.
John: Hey Mike, I've been noticing that you've been reaching to your nutsack every 15 minutes.

Mike: Naw dog, I'm doing a phone-check.
by Elephantshoe November 05, 2008