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But the Other Half is more than just a modern update to the Nokia-style fascias of yore: they can also bring new functionality, content or settings to the device.
Once the Other Half is snapped on, it can update the phone over NFC. On the tester phone I used, it added a new look and feel called Snow White (pictured above) to the device.
Jolla is hoping third parties will run with the idea, particularly marketing agencies and content producers, and make their own Other Half backplate. A music company could, for example, sell an Other Half with a group's new album on and interviews with the band, or a football team could sell one in team colours with their latest mobile app included.
There are also hardware possibilities: Other Halves could be made with hard keyboards or extra batteries onboard.
Taking off the other half gives you a peek at the battery, which is 2100mAh and removeable. Jolla estimates it gives nine or ten hours of talk time.
The camera is distinctly average, and struggles in low light.