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Does setting a dark wallpaper or theme on a phone improve its battery life?
Only OLED / AMOLED / SAMOLED displays can save power if a black wallpaper is kept. Normal LCD displays will have no effect and will use the same power if a white or lighter wallpaper is use.

The reason for that is in OLED displays, individual pixels light up to create an image. So on the black regions, you are actually turning the pixels off thus they use no power. Whereas LCD has a back-light which is always on no matter what colour is displayed on your screen.

Here are list of the best 5 OLED Smartphones Today:

Sale
Google Pixel 4 XL - Just Black - 64GB - Unlocked
Point and shoot for the perfect photo. Capture brilliant color and control the exposure balance of different parts of your photos.
$806.00
Huawei Mate 30 Pro LIO-L29 256GB 8GB RAM (GSM Only, No CDMA) Factory Unlocked No Warranty - 4G LTE International Version (Black)
Unlocked cell phones are compatible with GSM carrier such as AT&T and T-Mobile, but are not compatible with CDMA carriers such as Verizon and Sprint.
$924.99
Sale
Samsung Galaxy Note 10+ Plus 256GB GSM Unlocked Smartphone, Aura Black (Renewed)
Fast-charging, long-lasting intelligent power and super speed processing outlast whatever you throw at Note 10+. S pen’s newest Evolution gives you the power of air gestures, a remote shutter and playlist button and handwriting-to-text, all in One Magic wand.
$662.99
Apple iPhone XS Max, 64GB, Space Gray - Fully Unlocked (Renewed)
Fully unlocked and compatible with any carrier of choice (e.g. AT&T, T-Mobile, Sprint, Verizon, US-Cellular, Cricket, Metro, etc.).
$563.55
Xiaomi Mi Note 10 128GB 108MP Penta Camera 6.47″ LTE Factory Unlocked Smartphone (International Version) (Glacier White)
6.47"3D curved AMOLED display Corning Gorilla glass front and back, 1080x2340 pixels 398 PPI - HDR 10 - Responsive in-screen fingerprint sensor - TÜV Rheinland low blue light mode
$436.79