This is a great battery pack if you don’t have a USB C device. It comes with two cables built in, one for micro-USB and lightning for iOS devices (and can simultaneously charge both , has a USB port for another device, and even a built in LED flashlight. I find a very handy gadget for day to day use and very food for traveling (via the Wirecutter).
I’m surprised there are a couple of these card shaped, omni tools out there; basically, they pack a few tools in one card. They’re kind of like swiss army knives, minus the knife. The one I use is called the Pocketmonkey. I keep it in my wallet for the occasional screw driving and measuring, but I’ll admit the bottle opener is what I primarily use it for.
Google Voice is a very useful service by Google, adding features to your phone like voicemail transcription, call recording, and call blocking. Strangely missing from Google Voice’s main features is the most important part of the telephone: making calls. In order to do that, you have to use your regular phone or use Gmail’s calling service. However, there’s an app that allows you to use that Gmail calling service and use it on your iOS and Android device to make calls: Talkatone. Now instead of using your phone minutes (or if your device doesn’t even have a cellular connection), you can use the app to make calls over wi-fi or 3G. It’s very handy if you say lose a phone or are running low on minutes and need to make a call. The app even came in handy when I was in Japan and needed to make a free call to the United States (probably routed my call through the us servers, but your mileage may vary).