When 2 people jork it on the phone with other for a long period of time (depends on your stamina) ((long is more than 2-5 minutes)) it can be used for long distance couples or e-whores so they can get that bag. Either way it's kinda okay, but you must make sure you talk to one another during this process or it is weird and pointless, you might as well just watch porn.
downside: not as pleasuring
benefit: 0% chance of std or pregnancy
Girl A: "Omg girl, you're never gonna believe who I was mobile canoodling with last night"
Girl B: "Omg was it Austin again?"