Ask HN: n00b question reguarding Prey and cellphone tracking

I'm just wondering if anyone knows how apps like Prey use your data. I just installed it, and am wondering if the thing is constantly eating into my data plan. It probably doesn't use a great deal, but my plan is kind of crappy so I thought I'd double check. Apologies for such a lame question, but I don't have a Quora so thought I'd ask here. Thanks!