The bulge is enough for an attentive pickpocket, especially with how large smartphones have become. Prevention is unlikely, so just check periodically so you ar

The bulge is enough for an attentive pickpocket, especially with how large smartphones have become. Prevention is unlikely, so just check periodically so you aren't surprised later. Further, I think it might even signal to a potential pickpocket that you are aware of you surroundings, even though it's just habit.