When your phone is resting on or near your genitals and goes off when set to vibrate giving you a little sexual pleasure when someone calls. Happens especially when you place your phone on vibrate and place it near your crotch when driving to know when your phone going off when listening to loud music in the car. Phone jobs can be awkward, esp when your mother calls; however, they can also be an excellent way to derive sexual pleasure from someone you have no chance of getting it from.
"I was driving home and my phone went off, I let it go for a few rings cuz it felt good but then I was mortified when I saw that my mom just gave me a phone job."
"I saw it was Sarah calling so I let it go to voice mail to let the phone job last longer."
The act of pleasuring ones self by taking 2 phones (cordless or not doesnt matter) and putting them on either side of the your penis and then masterbating with the phones. The experience can sometimes be better if someone is talking on the phone during this act.
Dude, my mom called me last night and while she was talking i gave my self a phone job. Best one ever.