| Specification Karbonn A21 Plus |
| Root Karbonn A21 Plus |
| Unlock Karbonn A21 Plus |
| Firmware Karbonn A21 Plus |
| Developer Mode Karbonn A21 Plus |
| Bypass Lock Screen Karbonn A21 Plus |
| Karbonn A21 Plus Factory Reset |
| Screenshot Karbonn A21 Plus |
|
OS: Android v4.2 (Jelly Bean) CPU: Dual core, 1 GHz RAM: 4 GB Display: 5 inches (12.7 cm) Battery: Li-ion |
| *#06# | - International Mobile Equipment Identity |
| *#*#3646633#*#* or *#*#54298#*#* | - Engineering Mode (for smartphones based on MTK processor) |
| *#*#4636#*#* | - Display information about Phone, Battery and Usage statistics |
| *#*#225#*#* | - Calendar Storage, check your events in calendar |
| *#*#426#*#* | - Debug information for Google Play service. |
| *#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 system hidden menu. |
| *#*#36245#*#* | - Display a debug information about your email ID |
| *#*#8255#*#* | - Google Talk Service Monitor in Android mobile phones will monitor Google Talk host address and port, your Google JID, your device ID, GTalk connection status, your connection history |
| *#*#64663#*#* | - Mobile phones Hardware Test |
| *#*#7780#*#* | - Android factory reset code. |
| *2767*3855# | - Complete wiping of your mobile |
| *#*#232338#*#* | - Shows Wi-Fi Mac-address |
| *#*#34971539#*#* or *#34971539# | - Display full information about the camera. |
| *#*#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#*#* | - Test GPS |
| *#*#197328640#*#* | - Enabling test mode for service activity |
| *#*#0283#*#* | - Packet Loopback test |
| *#0228# | - battery calibration |
| *#*#232339#*#* OR *#*#526#*#* | - Wireless Lan Tests |
| *#*#0*#*#* | - LCD test |
| *#*#3264#*#* | - See Ram version |
| *#*#1111#*#* | - FTA Software version |
| *#*#2664#*#* | - Touch-Screen test |
| *#*#0588#*#* | - Test the proximity sensor |
| *#*#8351#*#* | - Enables voice dialing logging mode |
| *#*#232331#*#* | - Show Bluetooth Test Mode |
| *#*#232337#*# | - Bluetooth address |
| *#*#7262626#*#* | - Field test |
| *#*#0289#*#* OR *#*#0673#*#* | - Audio test |
| *#*#0842#*#* | - General Test Mode (vibration test and backlight test) |
| *#*#2663#*#* | - Touchscreen Accuracy Test |
| *#*#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 on your phone |
| #43# | - Disable call waiting on your phone |
| *#43# | - Check status of call waiting |
| GSM codes for Call Forwarding | |
| ##002# | - Disable All Call Forwarding |
| **004*PhoneNumber# | - Set all configured call diversions to PhoneNumber |
| ##004# | - Unregister all configured call diversions |
| Call Forward All | |
| *21*PhoneNumber# | - Register and activate divert all calls to PhoneNumber |
| ##21# | - Unregister divert all calls |
| *21# | - Divert all calls Enable |
| #21# | - Divert all calls Disable |
| *#21# | - Check status of divert all calls |
| Forwarding in case of "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 on your phone |
| #61# | - Disable divert on no answer calls on your phone |
| *#61# | - Check status of divert on no answer |
| Call diversion when "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 |
| Barr all outgoing calls | |
| **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 |
| USSD Codes For Barring all calls | |
| **330*code# | - Activate all calls barring |
| #330*code# | - Deactivate all calls barring |
| *#330*code# | - Check status of barr all calls |
| Activate or deactivate barring all outgoing international calls | |
| **331*code# | - Barr all outgoing international calls Activate |
| #331*code# | - Barr all outgoing international calls Deactivate |
| *#331*code# | - Check status of barr all outgoing international calls |
| Activate barr all outgoing international calls except home country | |
| **332*code# | - Barr aall outgoing international calls except home country Enable |
| #332*code# | - Barr all outgoing international calls except home country Disable |
| *#332*code# | - Check status of barr all outgoing international calls except home country |
| USSD Codes For Barring all outgoing calls | |
| **333*code# | - Barr all outgoing calls Activate |
| #333*code# | - Barr all outgoing calls Deactivate |
| *#333# | - Check status of barr all outgoing calls |
| Barr all incoming calls | |
| **35*code# | - Activate all incoming calls barring |
| #35*code# | - Deactivate all incoming calls barring |
| *#35# | - Check status of barr all incoming calls |
| USSD Codes For Barring all incoming calls when roaming | |
| **351*code# | - 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 |
| Activate or deactivate barring all incoming calls | |
| **353*code# | - Enable Blocking all incoming calls on your phone |
| #353*code# | - Disable Block all incoming calls on your phone |
| *#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. | |
 | Zlzjnj | March 03, 2024 |
| Overall, this Android phone offers decent performance and camera quality. However, the low RAM and internal memory may limit functionality. The battery life is average, and the design is basic. | ||
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