Various Tips and Tricks
Try to find posters and objects throughout the world. You can use these as currency in the shop to buy new gadgets.
Save up for the distraction gadget. Being able to tap phones is cool, but making a guard run to a ringing phone is more useful.
Look for pepper spray, screwdrivers, and batteries. They're small and hard to see, but worth seeking out for the useful abilities that they facilitate.