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S21 is a technology website bringing together hundreds of independent expert reviews of smartphones, tablets, TVs and kitchen appliances, plus over 100,000 user reviews, and buying guides and links to the best online deals. Looks familiar? We used to be Mobile Phones UK - reviewing mobile technology since 2001.
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The HTC U Ultra is a premium phone with a "liquid surface" construction and a second display that shows top contacts and shortcuts. It has a good screen, plenty of memory, and a fast processor, but battery life isn't so hot, and there's no 3.5mm audio jack. The phone is expensive when you consider the competition.
The P10 Plus is Huawei's best phone ever, and a rival for the iPhone 7+ and Galaxy S8. It's superfast, ultraslim, has a top camera, massive amounts of memory, and good battery life. But the Chinese brand has overreached when it comes to pricing, and misses out on a 5-star review for that reason.
The Motorola G5 Plus is one of the best mid-range phones of 2017. Good looks are combined with a superfast octa-core processor, 32GB of memory, a good camera and decent battery life. Top value for money!
The Samsung Galaxy S8 takes Samsung's infinity screen concept into new territory, with an enormous 5.8 inch quad-HD dual-curved display packed into a compact handset. Brimming with market-leading features, the Galaxy S8 is the best-looking and arguably the best-equipped phone on the market in 2017, but it has a price to match.
The Huawei P10 is an ultraslim metallic glass phone with dual cameras, a superfast processor, strong battery life and very generous storage from its 64GB of memory. It's impressive, but at launch it's too expensive. Look for the price to fall, and the P10 will be an outstanding, though quirky phone.
The 5th generation Moto G5 phone is a good value mid-range phone with smart looks, smooth performance, a decent camera, and reasonable battery life. It's not the most exciting phone you can buy, but it's a safe low-cost option.
The HTC U Play is a mid-range phone that's priced too high and comes with a list of problems. Camera performance is mixed, battery life is poor, and there's no audio jack - only a USB Type-C connector for headphones. It's not a phone we can recommend.
The 2017 edition of the Huawei P8 Lite is one of the best mid-range smartphones. Its stylish superslim design and ultra-bright hi-res display make it a nice phone to handle, and it delivers fast performance from its 8-core processor. Running Android 7, it comes with an excellent camera and large battery too.
The Samsung Galaxy A5 2017 is a beautiful phone that's been over-priced. On monthly contracts, it will cost around the same as the Galaxy S7, but this is not a flagship phone. Wait for the price to fall to around £20/month, and you'll get a stunning phone with a sharp screen, fast processor, and plenty of memory.