Body design and specifications are feasible in 2020
Why in 2020 I still discuss oppo f9 (pro) mobile phones where there are so many products from oppo that are already on the market, there are a number of things that make me still interested in discussing the mobile phone output in August 2018 (already 2 years). if the reader still wants to buy this mobile phone in our opinion is still feasible in 2020. apart from indeed because of a sturdy body and design that in our opinion is still not outdated. In 2018 OPPO released two variants of the regular version of the OPPO F9 (4/64) and the pro version (6/64). here we try to discuss the type of pro version (6/64) where the two versions are not much different in specifics.
BODY
Dimension
156.7 x 74 x 8 mm 
Weight
169 g 
Build
Glass Front (gorilla glas 6) , Alumunium Back, plastic frame
Sim
Dual sim
DISPLAY
Type
LTPS IPS LCD Capacitve touchscreen 16 M Colours
 Size
6.3 Inches
 Resolution
1080 x 2340 Pixels, 409 ppi density
 Protection
Corning Gorilla Glass 6
talking screen (lcd) in our opinion the screen of the oppo f9 can still be categorized as very feasible. plus the notch display that is not so big still makes this mobile screen comfortable to use playing games or for browsing, or streaming movies. the color coming out of the oppo f9 lcd is also quite sharp but not to be compared with an amoled screen.
PLATFORM
 OS
Android 8.1 (Oreo), ColorOS 5.2
 Chipset
Mediatek MT6771 Helio P60 (12nm)
 CPU
Octa Core (4x2.0 GHz Cortex A73 & 4x2.0 GHz Cortex A53 
 GPU
Mali G72 MP3
using mediatek MT6771 Helio P60 (12nm) oppo f9 pro mobile phone is fast enough for social media, multitask, word, office etc. where this chipset also consumes less battery. for oppo f9 graphics pro using Mali 672 MP3 is still relevant also used in 2020. although it cannot be paired with a Snapdragon chipset but if used games with standard graphics this mobile phone still can and does not force close.
MEMORY
 Internal
4/64, 6/64 (Pro)
 Cardslot
Yes (Dedicated)
CAMERA
Main Camera
16 MP f/1.8 1/3.1 1.0um PDAF
  2 MP f/2.4 (Depth)
LED Flash,HDR, Panorama
1080p@30fps 
Selfie Camera
Single 25 MP f/2.0 26mm (wide) 1/2.8  0.9um 
1080p@30fps
We did not discuss much in the camera sector, because in 2020 there were many mobile phones that had more than two lenses and even the trend of four cameras. in oppo f9 there are only two main camera lenses. the main camera is 16 mp and the second lens is only 2 mp. for the results we can say it is not competitive in 2020 but the photos from the Oppo F9 are not bad, especially if the conditions are good light. and some features that we think are in the current category such as bokeh, livemode, or hyperlase.


FEATURES
 WLAN
a/b/g/n/ac dual-band, wifi direct,hotspot
 Bluetooth
4.2  A2DP LE 
 GPS 
A-GPS, Glonass, BDS.
 NFC
NO
 Infra Red
NO
 Radio
YES
 Sensor
Fingerprint (Rear Mounted), accelerometer, gyro, proximity, compass, barometer
BATTERY
Capacity
Non Removable 3500 mAh, Fast Charging 20W, VOOC
 USB
Micro USB. OTG
 Sound
Jack Audio 3.5
Conclusion of OPPO F9 in 2020
excellence:
1. body that is still relevant
2. ingredients that don't look cheap
3. Strong battery life.
4. vooc for very fast charging
5. streo sound

Weaknesses:
1. Standard camera resolution
2. the camera is still two lenses
3. Standard chipset
4. no NFC


So for those of you who are still interested in using the OPPO F9 handphone in 2020, it is still feasible, especially for those of you who don't like to play games, who use mobile phones only for communication, and standard photos on social media. this oppo f9 look like an iphone 7 plus so it's still quite attractive to the eye. not too many elements in the back body of the handphone. for additional information oppo f9 can still be used to play games with high graphics settings (mobile legends) and hd (PUBG) and when applied not so much framedrop is also not hot if used for a long time. still quite relevant not if you still want to use this handphone in 2020.