These shirts look similar to a university/college style of t-shirt. The front includes the PLA Bell logo with the words “Phone Losers of America” and “EST. 1994″ which is the year the PLA began.
If you're going to change the color on this shirt to anything other than black, be warned that the source images have a bit of black around all of the lettering and logo, so if you make the shirt too light of a color, some of the black around the edges may be visible. It may look cool or it may look horrible. Best to stick with dark colors, just in case.