Maxwell Smart’s shoe phone might be effectual in a setting where you aren’t allowed to carry a mobile-phone and you need it desperately. This DIY from Instructables allows you to play spy unnoticed in such a situation. What you need is a pair of wooden-heeled shoes, a Bluetooth headset, and a Panasonic GD55 or any other tiny cellphone. Though assembling it, is not that easy a job, yet the video after the jump might aid you in doing it fluently: