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TCL is a new name for phones, but the company has been making and selling them for years under the Alcatel brand. Now it's showing off concept designs galore for interesting designs.

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We first saw TCL's foldable phone concepts in late February, which were extremely bare bones mock-ups. This is a much more mature prototype.

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While the Samsung Galaxy Fold is a large phone that opens into a tablet, TCL envisions a more pocketable flip phone for one of its designs. 

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This design exhibits a large air gap and something TCL calls its Dragon Hinge, however it's also working on a different style that lays flat.

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It looks like a billfold here.

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Here are more pictures of foldable concepts before we get to the next prototype.

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TCL calls this one the One Piece, because it's made of  two pieces of glass fused together into one. Interestingly, there are no buttons and no ports.

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You'd have to rely on an in-screen fingerprint reader, pin or face unlock to get in, as well as wireless charging to power it up.

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Bone conduction is one way that a buttonless phone could emit sound, though TCL reminds us this is only a rough prototype -- it's something they're thinking about, but haven't solved.

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The waterfall display shows off a much more elegant phone with deeply curved sides and a wraparound screen that stops at the edges.

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As with its other concept devices, see three rear cameras on this mock-up design.

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Last up is the TCL Plex, which has a 6.5-inch screen and three rear cameras.

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This midrange device features tools like a rear-mounted fingerprint sensor.

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The display can turn standard-def content into high-definition content with built-in software.

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The black and white colors also glint in the light.

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There's a programmable side key, too.

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Read all about the TCL Plex specs and sub-$400 pricing.

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