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S21 is a technology website bringing together hundreds of independent expert reviews, over 100,000 user reviews, plus articles, buying guides and links to the best online deals. Looks familiar? We used to be Mobile Phones UK - reviewing mobile technology since 2001.

Latest reviews and articles:

 
Amazon Fire TV Stick review
The Amazon Fire TV Stick is probably the cheapest way to add Smart TV functionality to your TV. The compact stick brings access to Netflix and Amazon Instant Video, plus dozens of other video and music streaming services, plus games. It's easy to install, and portable too, making use of Wi-Fi to stream content from your broadband internet connection.
 Sony Xperia E4 review
The Sony Xperia E4 is an entry-level phone that lacks 4G connectivity, but does offer a large screen, a capable camera, a big battery, and a decent amount of memory. It's available for under 100 on PAYG, or on the cheapest monthly contracts.
   
 
HTC One M8s review
The HTC One M8s is the same as the One M8, but with a new camera, updated 64-bit 8-core processor, a larger battery and Android Lollipop. It's cheaper too! If you missed out on the M8, perhaps this is the upgrade you've been waiting for.
 Sony Xperia E4g review
The Sony Xperia E4g is a solid and practical phone that offers all the smartphone essentials at a fair price. Particular strengths include an excellent camera and robust battery life. It's a strong all-round performer with no weak points.
   
 
LG G Flex 2 review
The LG G Flex 2 is something different - a smartphone with a curved screen and body. It's certainly designed to attract attention, but is a practical option too, with careful thought going into its unique design. It's also a high-spec smartphone with an 8-core processor and an excellent camera.
 Samsung Galaxy S6 review (updated)
The Samsung Galaxy S6 brings premium metal-and-glass looks to Samsung's winning formula of a high-spec Android smartphone. The S6 features a stunning quad-HD AMOLED screen, an 8-core processor, enhanced cameras, Android Lollipop and a wealth of other features. The only things holding it back are the lack of expandable memory, and the rather average battery life.
   
 
Microsoft Lumia 535 review (updated)
Microsoft's first smartphone is the entry-level Lumia 535. Selling for less than 100, or on very cheap contracts, the phone has a lot going for it, including a huge 5 inch display, a 5 megapixel front camera and good battery life.
 Microsoft Lumia 435 review
If you're looking for a smartphone costing around 50, your choices are very limited, but the Microsoft Lumia 435 gives you a lot for your money. It's a dinky phone with a decent screen, a dual-core processor and plenty of memory. The cameras are very poor and the battery life not much better, but it's good as a first phone or as a spare.
   
 
Motorola Moto E 4G review
The second-generation Motorola Moto E is an entry-level smartphone that offers outstanding value for money. It may lack premium styling, but it has everything else you could want from a budget phone - and more.
 Samsung Galaxy S6 Edge review
Just when you thought all smartphones looked the same, the Samsung Galaxy S6 Edge brings a fresh new look. Featuring a double-edged curved screen with special edge display features, it's one of the best-looking phones you can buy. It's also super-powerful, with an 8-core processor, outstanding cameras, plenty of memory and the latest Lollipop flavour of Android. But make sure you're sitting down before you look at the price!
   

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