20 iPhone Tricks You Should Know by Megan Riesz, csmonitor.com: Like iMessage overseas without pesky fees, setting up a personal hotspot, changing Siri's accent (and gender), turning your iphone into a TV remote, taking a screen shot, making Siri mad and more!
With Canon cartridges, you just press and hold the "Stop/Reset" button for five seconds when it says you're out of ink. You need to be sure to remove the cartridge when it's actually empty, otherwise it could damage your printer. Also, don't run maintenance when a cartridge is empty. Once you replace it, the printer will begin monitoring ink levels again.