Nokia N-Gage

The Nokia N-Gage is the most awkward hybrid device ever conceived. Launched in 2003, it forced users to hold the phone sideways against their face to make calls, earning the infamous nickname "taco phone"—a design flaw that no other smartphone has replicated. Its game cartridges required removing the battery to swap, making it slower than the Game Boy Advance's instant-swap capability. Sales tell the story: the N-Gage sold only 3 million units against the Game Boy Advance's 81 million, a 96% deficit. Its library of 58 games paled in comparison to the GBA's 1,500, and at a launch price of $299, it cost 50% more than a GBA SP. The N-Gage is a cautionary tale of prioritizing novelty over usability.