OPPO A21 2020 secret codes

OS: Android v11

CPU: Octa core (2.3 GHz, Quad core, Cortex A53 1.65 GHz, Quad core, Cortex A53)

RAM: 128 GB

Display: 5.7 inches (14.48 cm)

Battery: Li-Polymer

OPPO A21 2020 smartphone runs on Android v11 operating system. The phone is powered by Octa core (2.3 GHz, Quad core, Cortex A53 1.65 GHz, Quad core, Cortex A53) processor. It has 128 GB. Internal storage options which can be extended with the help of Yes, Up to 256 GB. The smartphone has a IPS LCD providing. The smartphone is fueled with a Li-Polymer. The sensors include Light sensor, Proximity sensor, Accelerometer, Compass. Connectivity features in the smartphone include Bluetooth, A-GPS, Glonass, 3.5 mm Jack and more.

Secret codes for OPPO A21 2020

*#06#	- International Mobile Equipment Identity
##3646633## or ##54298##	- Engineering Mode (for smartphones based on MTK processor)
##4636##	- Testing menu only have Phone Information, Usage Statistics and Wi-Fi information.
##225##	- Calendar Storage, check your events in calendar
##426##	- Information about the connection with Google Play Services
*#0011#	- ServiceMode
*#0808#	- Change USB Settings
*#9900#	- Dump mode
*#9090#	- Diagnostic configuration
#0#	- General Test Mode
*#2663#	- TSP / TSK firmware update
#12580369#	- Software and hardware info
*#0283#	- Audio Loopback Control
#7465625638#	- Insert Network Lock Key Code
##759##	- RLZ Debug UI (Device ID, Activation Status, Some Ping Stuff, and few other things)
##36245##	- Display a debug information about your email ID
##8255##	- Access GTalk Service Monitor
##64663##	- Hardware Test (Version, Sensors, Sim, WLAN, Bluetooth, Battery, OTG, Radio, Speakers)
##7780##	- Used for a factory data reset.
27673855#	- Complete wiping of your mobile
##232338##	- Shows Wi-Fi Mac-address
##34971539## or *#34971539#	- See camera information.
##1234##	- PDA and Phone firmware info
##7594##	- Changing the power button behavior-Enables direct poweroff once the code enabled
##1472365##	- For a quick GPS test
##273283255663282##*	- For a quick backup to all your media files
##1575##	- Different GPS Test Code
##197328640##	- Enabling test mode for service activity
##0283##	- Packet Loopback test
*#0228#	- battery calibration

##232339## OR ##526##	- Wireless Lan Tests
##0##*	- LCD display test Code
##3264##	- See Ram version
##1111##	- FTA Software version
##2664##	- Touch-Screen test
##0588##	- Test the proximity sensor
##8351##	- Enables voice dialing logging mode
##232331##	- Bluetooth Test Mode
##232337#*#	- Displays bluetooth device address
##7262626##	- Field test
##0289## OR ##0673##	- Audio test
##0842##	- Device test (vibration test and backlight test)
##2663##	- Display device's touch-screen version
##44336##	- Displays Build time and change list number
##49862650468##*	- PDA, Phone, Hardware, RF Call Date firmware info
##8350##	- Disables voice dialing logging mode
##2222##	- FTA Hardware verion

GSM codes for OPPO A21 2020

Change code
*03old codenew codenew code#
- Change code for call barring
*04old PIN codenew PIN new PIN#
- Change SIM Card PIN code
*042old PIN2 codenew PIN2new PIN2#
- Change SIM Card PIN2 code
*05PUK codenew PUKnew PUK#
- Change SIM Card PUK code
*052PUK2 codenew PUK2new PUK2#
- Change SIM Card PUK2 code

Call waiting
*43#	- Activate call waiting
#43#	- Deactivate call waiting
*#43#	- Check status of call waiting

Configure Call Forwarding
##002#	- Disable All Call Forwarding
*004PhoneNumber#	- Set all configured call diversions to PhoneNumber
##004#	- Unregister all configured call diversions

Call Forward All
21PhoneNumber#	- Register and activate divert all calls to PhoneNumber
##21#	- Unregister divert all calls
*21#	- Enable Divert all calls on your phone
#21#	- Disable Divert all calls on your phone
*#21#	- Check status of divert all calls

Set call forwarding in case of "no answer"
*61PhoneNumber#	- Register and activate divert on no answer to PhoneNumber
##61#	- Unregister divert on no answer
*61#	- Activate divert on no answer calls
#61#	- Deactivate divert on no answer calls
*#61#	- Check status of divert on no answer

Call diversion when "not available"
*62PhoneNumber#	- Register and activate divert on not reachable
##62#	- Unregister divert on not reachable
*62#	- Activate divert on not reachable
#62#	- Deactivate divert on not reachable
*#62#	- Check status of divert on not reachable

Divert calls if your line is "busy"
*67PhoneNumber#	- Register and activate divert on busy
##67#	- Unregister divert on busy
*67#	- Activate divert on busy
#67#	- Deactivate divert on busy
*#67#	- Check status of divert on busy all call types
#6711#	- Check status of divert on busy voice calls
#6713#	- Check status of divert on busy fax calls
#6725#	- Check status of divert on busy data calls

All outgoing calls barring
*33code#	- Activate barr all outgoing calls (for code see "Safety" above)
#33*code#	- Deactivate barr all outgoing calls
*#33#	- Check status of barr all outgoing calls

Blocking all calls
*330code#	- Activate all calls barring
#330*code#	- Deactivate all calls barring
#330code#	- Check status of barr all calls

USSD Codes For Barring all outgoing international calls
*331code#	- Turn On Barr all outgoing international calls
#331*code#	- Turn OFF Barr all outgoing international calls
#331code#	- Check status of barr all outgoing international calls

Activate barr all outgoing international calls except home country
*332code#	- Enable Barr all outgoing international calls except home country on your phone
#332*code#	- Disable Barr all outgoing international calls except home country on your phone
#332code#	- Check status of barr all outgoing international calls except home country

Blocking all outgoing calls
*333code#	- Turn On Barr all outgoing calls
#333*code#	- Turn OFF Barr all outgoing calls
*#333#	- Check status of barr all outgoing calls

All incoming calls barring
*35code#	- Activate all incoming calls barring
#35*code#	- Deactivate all incoming calls barring
*#35#	- Check status of barr all incoming calls

Blocking all incoming calls when roaming
*351code#	- Activate all incoming calls when roaming barring
#351*code#	- Deactivate all incoming calls when roaming barring
*#351#	- Check status of barr all incoming calls when roaming

USSD Codes For Barring all incoming calls
*353code#	- Activate Blocking all incoming calls
#353*code#	- Deactivate Blocking all incoming calls
*#353#	- Check status of Blocking all incoming calls

Thomas Nilan
Smartphone Expert

Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.

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