Keep an emergency $20 in your phone case

There is a lifehacker article about keeping an emergency extra $20 between your iPhone case and your phone itself.  An interesting idea, indeed.  But what was more interesting is what the readers commented.  They said that they stashed their RFID badges that unlock their company doors, thus they can open the doors with their iPhone.  Very interesting!  I would use it myself if I worked at a company that used badges.  Here’s the article: Keep an emergency $20 in your phone case.