This is the Zanco Tiny T2, a cell phone only slightly larger than a regular USB flash drive. The manufacturer claims it is the smallest cell phone ever made. It looks the part.

First, the Zanco Tiny T2 weighs only 31 grams (1.09 ounces) and is said to be very small, measuring 2.4 x 1.18 x 0.65 inches.

Funded on Kickstarter in one day, the Zanco Tiny T2 has a 7-day standby battery life, a camera (which might qualify as a spy cam at this size), video recorder, Bluetooth 3.0, and MP3 and MP4 players, FM radio, calendar, text messaging, and up to 32GB of storage with a Micro SD card, the T2 has a lot of features for its tiny size. Of course, it can also make calls.

Of course, all of these features are quite limited given its size. The display is only 120 x 96 pixels. Enough to play Snake or Tetris if your eyes are sharp enough, but not much more.

The camera is also very low-end at 0.3 megapixels, but obviously you're not buying this to take Instagram photos or Facebook selfies.

It does not support LTE, only 2G and 3G. But it should work worldwide. Functionally, it's just a phone.

Price: $130. if Zanco had a keychain version, it could be used as an emergency phone. zanco claims the phone will start shipping in april. if you doubt (rightfully so) that it shipped on Kickstarter, Zanco has a 2017 and already has another small phone on the market, available on Amazon for $50.

On the other hand, if you really want a secondary phone option that is always available, you may be able to find a used Apple Watch Series 3 with LTE for near that price.