| Specification OPPO A4 |
| Root OPPO A4 |
| Unlock OPPO A4 |
| Firmware OPPO A4 |
| Developer Mode OPPO A4 |
| Bypass Lock Screen OPPO A4 |
| OPPO A4 Factory Reset |
| Bypass FRP OPPO A4 |
| Screenshot OPPO A4 |
|
OS: Android v11 CPU: Octa core (2 GHz, Quad core, Cortex A73 2 GHz, Quad core, Cortex A53) RAM: 128 GB Display: 6.2 inches (15.75 cm) Battery: Li-ion |
| *#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#*#* | - Check your events in calendar |
| *#*#426#*#* | - Google Play service - Debug information |
| *#0011# | - ServiceMode |
| *#0808# | - Change USB Settings |
| *#9900# | - Dump mode |
| *#9090# | - Diagnostic configuration |
| *#0*# | - General Test Mode |
| *#2663# | - TSP / TSK firmware update |
| *#12580*369# | - Software and hardware info |
| *#0283# | - Audio Loopback Control |
| #7465625*638*# | - Insert Network Lock Key Code |
| *#*#759#*#* | - Rlz Debug UI. Unique Device ID, PID, ACAP other data related to application installation. |
| *#*#36245#*#* | - Display a debug information about your email ID |
| *#*#8255#*#* | - Access GTalk Service Monitor |
| *#*#64663#*#* | - Engineering Mode (Version, WLAN, Bluetooth, Battery, Speakers) |
| *#*#7780#*#* | - Factory Data Reset. |
| *2767*3855# | - Reinstall factory ROM |
| *#*#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 |
| *#*#273283*255*663282*#*#* | - For a quick backup to all your media files |
| *#*#1575#*#* | - 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 test Code |
| *#*#3264#*#* | - Show 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#*# | - Show device's Bluetooth address |
| *#*#7262626#*#* | - Field test |
| *#*#0289#*#* OR *#*#0673#*#* | - Audio test |
| *#*#0842#*#* | - Device test (vibration test and backlight test) |
| *#*#2663#*#* | - Show touch-screen version |
| *#*#44336#*#* | - Displays Build time and change list number |
| *#*#4986*2650468#*#* | - PDA, Phone, Hardware, RF Call Date firmware info |
| *#*#8350#*#* | - Disables voice dialing logging mode |
| *#*#2222#*#* | - FTA Hardware verion |
| Change code | |
| **03*old code*new code*new code# | |
| - Change code for call barring | |
| **04*old PIN code*new PIN *new PIN# | |
| - Change SIM Card PIN code | |
| **042*old PIN2 code*new PIN2*new PIN2# | |
| - Change SIM Card PIN2 code | |
| **05*PUK code*new PUK*new PUK# | |
| - Change SIM Card PUK code | |
| **052*PUK2 code*new PUK2*new PUK2# | |
| - Change SIM Card PUK2 code | |
| Call waiting | |
| *43# | - Enable call waiting |
| #43# | - Disable call waiting |
| *#43# | - Check status of call waiting |
| Configure Call Forwarding | |
| ##002# | - Disable All Call Forwarding |
| **004*PhoneNumber# | - Set all configured call diversions to PhoneNumber |
| ##004# | - Unregister all configured call diversions |
| Set Call Forward All | |
| *21*PhoneNumber# | - Register and activate divert all calls to PhoneNumber |
| ##21# | - Unregister divert all calls |
| *21# | - Activate all calls divert |
| #21# | - Deactivate all calls divert |
| *#21# | - Check status of divert all calls |
| Call diversion when "no answer" | |
| **61*PhoneNumber# | - Register and activate divert on no answer to PhoneNumber |
| ##61# | - Unregister divert on no answer |
| *61# | - Enable divert on no answer calls |
| #61# | - Disable divert on no answerl calls |
| *#61# | - Check status of divert on no answer |
| Configure call forwarding in case of "not available" | |
| **62*PhoneNumber# | - 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" | |
| **67*PhoneNumber# | - 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 |
| *#67*11# | - Check status of divert on busy voice calls |
| *#67*13# | - Check status of divert on busy fax calls |
| *#67*25# | - Check status of divert on busy data calls |
| All outgoing calls barring | |
| **33*code# | - 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 |
| Block all calls | |
| **330*code# | - Activation Barr all calls |
| #330*code# | - Deactivate Barr all calls |
| *#330*code# | - Check status of barr all calls |
| Activate barr all outgoing international calls | |
| **331*code# | - Turn On Barr all outgoing international calls |
| #331*code# | - Turn OFF Barr all outgoing international calls |
| *#331*code# | - Check status of barr all outgoing international calls |
| GSM codes for barring all outgoing international calls except home country | |
| **332*code# | - Activate all outgoing international calls except home country barring |
| #332*code# | - Deactivate all outgoing international calls except home country barring |
| *#332*code# | - Check status of barr all outgoing international calls except home country |
| Block all outgoing calls | |
| **333*code# | - 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 | |
| **35*code# | - Activation Barr all incoming calls |
| #35*code# | - Deactivate Barr all incoming calls |
| *#35# | - Check status of barr all incoming calls |
| Block all incoming calls when roaming | |
| **351*code# | - Activation Barr all incoming calls when roaming |
| #351*code# | - Deactivate Barr all incoming calls when roaming |
| *#351# | - Check status of barr all incoming calls when roaming |
| Activate barr all incoming calls | |
| **353*code# | - Enable Blocking all incoming calls |
| #353*code# | - Disable 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. | |
 | ClwCuko | March 08, 2024 |
| The phone has a decent battery life and fast charging, with good functionality and software. Calls and networks work well, and the design is sleek. Camera quality is decent. Good value for money. | ||
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