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Brand
 samsung samsung
Model
 samsung galaxy j4 samsung galaxy a51
Announced
 2018 May 2019 December 12
Status
 Available. Released 2018 May Available. Released 2019 December 16
Device Body
 glass front | plastic back | plastic frame glass front ( gorilla glass 3 ) | plastic back | plastic frame
Dimensions
 151.7 x 77.2 x 8.1 mm ( 5.97 x 3.04 x 0.32 in ) 158.5 x 73.6 x 7.9 mm ( 6.24 x 2.90 x 0.31 in )
Weight in gram
 175 172
SIM card
 dual SIM ( Micro-SIM | dual stand-by ) single SIM ( Nano-SIM ) or dual SIM ( Nano-SIM | dual stand-by )
Water Resistance
 No No
Display type
 Super AMOLED Super AMOLED
Display resolution
 720 x 1280 pixels | 16 : 9 ratio ( ~267 pixel per inch density ) 1080 x 2400 pixels | 20 : 9 ratio ( ~405 pixel per inch density )
Display size
 5.5 inches | 83.4 cm2 ( ~71.2% screen to body ratio ) 6.5 inches | 102.0 cm2 ( ~87.4% screen to body ratio )
Display Protection
 corning gorilla glass 3
Operating System
 android 8.0 ( oreo ) android 10 | upgradable to android 13 | one ui 5
CPU
 Quad-core 1.4 GHz cortex-a53 Octa-core ( 4x2.3 GHz cortex-a73 & 4x1.7 GHz cortex-a53 )
Chipset
 exynos 7570 Quadcore ( 14 nm ) exynos 9611 ( 10nm )
GPU
 mali-t720 mp2 mali-g72 mp3
Memory card
 microsdxc ( dedicated slot )
Memory v1
 16gb 2gb RAM 64gb 4gb RAM
Memory v2
 32gb 2gb RAM | 32gb 3gb RAM 128gb 4gb RAM | 128gb 6gb RAM | 128gb 8gb RAM | 256gb 8gb RAM
Primary camera
13 megapixel| lens aperture1.9 | 28mm ( wide ) | Auto focus
48 megapixel| lens aperture2.0 | 26mm ( wide ) | 1/2.0" | 0.8µm | phase detection autofocus
12 megapixel| lens aperture2.2 | 123˚ ( ultrawide )
5 megapixel| lens aperture2.4 | ( macro )
5 megapixel| lens aperture2.2 | ( depth )
Secondary camera
5 megapixel| lens aperture2.2
32 megapixel| lens aperture2.2 | 26mm ( wide ) | 1/2.8" | 0.8µm
Loud speaker
 Yes Yes
Audio jack
 Yes Yes
WLAN
 Wi-Fi 802.11 b/g/n | Wi-Fi Direct | hotspot Wi-Fi 802.11 a/b/g/n/ac | dual-band | Wi-Fi Direct
Bluetooth
 4.2 | a2dp | le 5.0 | a2dp | le
GPS
 Yes with a-gps glonass bds
NFC
 No Yes
Radio
 FM Radio FM Radio
USB
 microusb 2.0 USB Type-C 2.0 | otg
Sensors
 accelerometer | proximity fingerprint ( under display | optical ) | accelerometer | gyroscope | compass
Battery
 Li-lon 3000 mAh | removable li-po 4000 mAh | Non-removable
Battery Charge
 15w wired
Colors
 black, gold, gray color gradations black color gradations, white color gradations, prism color color gradations, prism color color gradations
Network technology
 gsm / hspa / lte gsm / hspa / lte
5G bands
Network speed
 hspa 42.2/5.76 mbps lte cat4 150/50 mbps hspa lte-a
GPRS
EDGE
Approx price
  • 120 GBP
  • 144 EUR
  • 1390 NOK
  • 1500 SEK
  • 9000 RUB
  • 150 USD
  • 760 BRL
  • 210 AUD
  • 190000 KRW
  • 20000 JPY
  • 200 SGD
  • 640 MYR
  • 530 AED
  • 2400 ZAR
  • 200 GBP
  • 247 EUR
  • 2340 NOK
  • 2500 SEK
  • 15100 RUB
  • 240 USD
  • 1280 BRL
  • 350 AUD
  • 320000 KRW
  • 33000 JPY
  • 340 SGD
  • 1080 MYR
  • 890 AED
  • 4100 ZAR