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That's a wrap for another Mobile World Congress. With the exhibit halls in Barcelona cleared out and the press conferences long done, it's time to look back on the week that was -- and what it means for the future of the wireless industry in 2017 and beyond.
1. What's old is new: Nokia, BlackBerry and Moto
As we said in the glory days of Nokia, the company's stubby phones would last forever. Nokia, or at least the company now licensing its brand, did its best to remind us of that in Barcelona when it rebooted one of its best-selling models ever, the 3310. The device isn't pretty, and it does barely anything, but neither of those attributes has stopped a wave of fascination (and the requisite backlash) over the "new" version of a phone that landed in our pockets 17 years ago. You get a month of battery life, but you'll have to give up your apps and touchscreen. The new Nokia 6, and the 5 and 3, have all of the modern phone smarts, but they were overshadowed at the show by their smaller, simpler sibling.
The Nokia lineup is just one refrain in a nostalgia theme that dominated Mobile World Congress. With the BlackBerry KeyOne, TCL revived the phone that gave us all sore thumbs. Though running Android, it has signature BlackBerry characteristics like BlackBerry Hub and -- gasp -- a physical keyboard.
Nostalgia is emotional, powerful and positive. Tech is just one of a multitude of industries to adopt a nostalgia theme. It's easy to see why: We always remember the first time we saw Star Wars or the first time we banged out an email on an original BlackBerry keyboard. But the strong counterargument to nostalgia is that it just means we've run out of ideas. Mobile World Congress did feel that way. Thanks to the 3310, the Nokia name is back in the spotlight, but will anyone actually buy the phone? And can the KeyOne's keyboard make people forget why they ditched BlackBerry in the first place? Comebacks are heartwarming, but they're also hard.
Is it hype or real? That's the constant question surrounding 5G -- which stands for the fifth generation of wireless technology. It promises a blazing connection that smokes even your fastest home broadband connection, and is supposed to transform the way we live by connecting everything around. More importantly, 5G will unlock the potential of many other tech trends like virtual reality and self-driving cars.
The answer is somewhere in between. Companies are showing off the hardware necessary to pull off those crazy speeds, but there are still tons of hurdles. The industry hasn't come to an agreement on what 5G will actually look like, and there's the issue of getting the necessary airwaves to power these new networks.
Watch this: 5G lets you remotely perform surgery with a robot arm
Still, that hasn't stopped companies like AT&T and Verizon from going forward with an early 5G-like service that will replace home broadband in select markets. Verizon will start looking for test customers at the end of this month.
There is reason to hope. A bunch of companies have come out and said they will push to get 5G here for mass deployment by 2019 -- a year ahead of schedule. A Verizon executive also hinted at the Samsung press conference that he might come back to Barcelona next year with a 5G phone.
This is a trend you'll continue to see on high-end phones, including the Galaxy S8, if these leaked photos and render are to be believed.
5. Who had the most interesting gadgets? Startups
It's not just the big boys at Mobile World Congress; you increasingly have to pay attention to the startup scene brewing at this trade show. Held alongside MWC is 4YFN (four years from now), a startup conference where mobile companies exhibit, pitch and learn from huge players like Facebook.
While virtual reality wasn't as visible on the main trade show floor, it was a popular theme at 4YFN. Also a trend were products and services aimed at families.
One of best pitches came from SkyGuru, which uses a combination of weather and flight plan data along with the sensors in your phone to quell your fear of flying. It does so by guiding you through your journey with explanations of noises and movements.
Another hot trend is the Internet of Things, or IoT -- the idea that anything "dumb" can wise up with a little connection to the web. Think a connected beehive designed by a startup from South Korea to make beekeeping easier for humans and less stressful for bees.
There was also a super-light, ultra-thin phone made from composites by a company called CarbonWorks. Good luck finding that in your local carrier store.
VR was everywhere at last year's show, but this year saw more emphasis on content and less on hardware. Around the world at the Game Developers Conference in San Francisco, though, plenty of new VR gear was on display from the likes of Qualcomm, Microsoft and LG.
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