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Phone LG K4 / Optimus Zone 3 / Rebel Samsung Galaxy Note 4 (CDMA) Samsung Galaxy S21
Current U.S. Carriers (none) (none) Verizon
Global Availability Released Released Released
Specifications 
Display Size 4.5" diag.
16 : 9
5.7" diag.
16 : 9
6.2" diag.
20 : 9
Display Resolution & Type 480 x 854 pixels
(~218 ppi)
LCD (TFT/TFD)
1440 x 2560 pixels
(~515 ppi)
AMOLED
1080 x 2400 pixels
(~424 ppi)
AMOLED
Display Refresh 60 Hz 60 Hz 120 Hz
Battery 1,940 mAh 3,220 mAh 4,000 mAh
Processor 1.1 GHz Qualcomm Snapdragon 210 (MSM8909) 2.7 GHz Qualcomm Snapdragon 805 2.8 GHz Qualcomm Snapdragon 888
RAM 1.5 GB 3 GB 8 GB
Storage 16 GB * 32 GB 128 GB *
Main Camera 5 megapixel 16 megapixel 12 megapixel
Wide Camera - - 12 megapixel
Tele Camera - - 64 megapixel
Video Capture 720p HD 4K UHD 8K
Front Camera 2 megapixel 4 megapixel 10 megapixel
Weight 3.99 oz
(113g)
6.21 oz
(176g)
6.03 oz
(171g)
Dimensions 5.19" x 2.62" x 0.35"
(132 x 67 x 8.9 mm)
6.04" x 3.09" x 0.33"
(154 x 79 x 8.5 mm)
5.97" x 2.8" x 0.31"
(152 x 71 x 7.9 mm)
Platform / OS Android Android Android
Network Bands

4G LTE: 2, 4, 5, 13

WCDMA: 1, 2, 5

CDMA: 850, 1900

GSM: 850, 900, 1800, 1900

*

4G LTE: 4, 13

WCDMA: 1, 2, 5

CDMA: 850, 1900

GSM: 850, 900, 1800, 1900

*

5G: 2, 5, 12, 25, 30, 41, 66, 71, 77-C, 260, 261

4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 29, 30, 38, 39, 40, 41, 46, 48, 66, 71

WCDMA: 1, 2, 4, 5, 8

CDMA: 800, 850, 1900

GSM: 850, 900, 1800, 1900

Data Technology LTE (Cat 3) LTE (Cat 4) NR (5G)
Features 
Barometer - - Yes
Fingerprint Reader - Yes Yes
in-display (ultrasonic)
Flashlight Yes Yes Yes
Water-Resistant - - Yes
IPX8 (SCUBA)
Accessibility
Hearing Aid Compatible Yes
M3, T3 (mostly tele-coil compatible)
Yes
M4, T3 (mostly tele-coil compatible)
Yes
M3, T3 (mostly tele-coil compatible)
TTY/TDD (Digital) Yes Yes Yes
Connectivity
Bluetooth Yes Yes Yes
Infrared (IR) - Yes -
MirrorLink - Yes -
NFC - Yes Yes
USB Yes
Micro-USB
Yes
Micro-USB
Yes
USB Type C
Wi-Fi Yes
4 (802.11 b,g,n)
Yes
5 (802.11 a,ac,b,g,n)
Yes
6 (802.11 a,ac,ax,b,g,n)
Input
Side Keys Yes Yes Yes
Stylus - Yes -
Touch Screen Yes
Capacitive
Yes
Capacitive
Yes
Capacitive
Memory
Memory Card Slot Yes Yes -
Music
Headphone Jack (3.5mm) Yes Yes -
Stereo Speakers - - Yes
Photo & Video
Miracast Yes - -
TV Output - Yes Yes
Power
Fast Charging - Yes Yes
Wireless Charging - - Yes
Voice
HD Voice Yes * Yes Yes
Speaker Phone Yes Yes Yes
  * Some versions only
  LG K4 / Optimus Zone 3 / Rebel Samsung Galaxy Note 4 (CDMA) Samsung Galaxy S21
  X > < X > < X

NOTE: Differences are highlighted with bold / black text for visual clarity only.

 
Phone LG K4 / Optimus Zone 3 / Rebel Samsung Galaxy Note 4 (CDMA) Samsung Galaxy S21

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