4 mid-range smartphones with ‘invisible’ fingerprint sensor

Galaxy A50, Mi A3, Oppo K3 and Vivo S1 are the cheapest smartphones on the market with in-screen fingerprint sensors.
Xiaomi Mi A3 (6 million VND)

Mi A3 is equipped with AMOLED panel FullHD + resolution and only 6.1 inch size. But along with Samsung’s Galaxy A50, these are the two cheapest smartphones on the market with a fingerprint sensor hidden under the screen, not physical form and located on the back as usual.

The Android model from Xiaomi has a monolithic design with a metal frame and a glass back. It has a 32 megapixel front camera. The back is cluster of 3 cameras. In particular, the main camera resolution of 48 megapixels, 8 megapixel ultra wide angle camera and a 2 megapixel camera used to measure the depth of field.

Mi A3 runs the Android operating system with the original interface. It uses Snapdragon 665 processor, 4 GB RAM and 64 GB internal memory. A 4,030 mAh battery uses USB-C port and supports fast charging.
Samsung Galaxy A50 (6 million VND)

Galaxy A50 is a Samsung product that makes Chinese smartphone makers feel pressure to invest in many features, inheriting from the Galaxy S or Galaxy Note series.
Not only does it have a triple-lens camera system on the back or a new full-screen display on the front, it also has in-screen fingerprint sensors like the Note 10 and S10. The Galaxy A50 also comes with 15W Fast Charge fast charging with USB-C port. The 4,000 mAh battery has a full charge time of about 100 minutes, which is equivalent to the Galaxy S10 +.
Oppo K3 (VND 6.99 million)

K3 is a combination of two lines of Oppo Reno and F11 series when it has a completely edge-to-edge screen design, an automatic retractable camera and a fingerprint sensor hidden under the screen. The sensor is also integrated with AI technology, so the unlocking speed is nearly 30% faster than rivals of the same range.

It uses a 6.5-inch screen with Full HD + resolution. The dual camera on the back is compact and has a resolution of 16 megapixels, but doesn’t have a super wide-angle lens like in Reno. K3 uses Snapdragon 710 processor, comes with 6 GB RAM and 64 GB internal memory.
Vivo S1 (6.99 million dong)

It has a 6.4-inch FullHD + screen, uses an AMOLED panel for high brightness, comes with Always on Display and a fingerprint sensor hidden inside the screen. The front camera has a resolution of up to 32 megapixels. In addition, Vivo S1 also has 3 rear cameras with a 16-megapixel main camera, 16-megapixel ultra wide-angle camera and 2-megapixel depth-of-field camera.

Products are equipped with MediaTek Helio P65 processor, 6 GB RAM and 128 GB internal memory. It runs Android 9 with Vivo’s unique FunTouch 9 interface. 4,500 mAh battery, supports fast charging but still uses microUSB port.

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