9. 4G
4G networks may seem like a given these days, but they've been around for less than a decade. The networks promised to make the mobile internet much faster and much better and were an upgrade to the 3G wireless network.
Sprint's HTC Evo was the first 4G phone by several months — it came out in March 2010, followed by a Samsung model in June of that year. Verizon didn't launch 4G until December 2010, and 4G didn't come to the iPhone until the iPhone 5 in 2012.
In 2019, carriers are expanding their 5G networks, and device makers are building 5G-compatible smartphones.
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