While thumb-typing or finger-swiping on your smartphone screen may be good enough for tweeting or texting, more wordy activities — like typing long email messages, taking notes at conference sessions or writing documents like this one — are grueling at best. For that, you need a physical keyboard.

There’s no shortage of Bluetooth keyboards intended for tablet users — some freestanding, some also acting as a screen cover or carry case. Many of them can be used with smartphones, but since most are as big as a tablet, they are less than convenient.

One solution is a folding Bluetooth keyboard, which is not only useable by most smartphones, but small enough to easily carry around. In this roundup, I report on five folding keyboards intended for use with smartphones: Cervantes Mobile Jorno, iwerkz Universal Foldable Bluetooth Keyboard, Perixx Periboard-805L, Targus Universal Foldable Keyboard for Android and Zagg Pocket Keyboard.

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