| Specification vivo Y91 (Mediatek) |
| Hard reset vivo Y91 (Mediatek) |
| Root vivo Y91 (Mediatek) |
| Unlock vivo Y91 (Mediatek) |
| Firmware vivo Y91 (Mediatek) |
| Developer Mode vivo Y91 (Mediatek) |
| Bypass Lock Screen vivo Y91 (Mediatek) |
| vivo Y91 (Mediatek) Factory Reset |
| Bypass FRP vivo Y91 (Mediatek) |
| Screenshot vivo Y91 (Mediatek) |
| Compare vivo Y91 (Mediatek) |
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OS: Android 8.1 (Oreo); Funtouch 4.5 CPU: Octa-core 2.0 GHz Cortex-A53 Display: 6.22" inc Camera: 13 MP,
Dual |
| *#06# | - IMEI, a unique number given to every single mobile phone |
| *#*#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#*#* | - This code show the number of festivities and events in your 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. Unique Device ID, PID, ACAP |
| *#*#36245#*#* | - Display Email debug informations |
| *#*#8255#*#* | - Access GTalk Service Monitor |
| *#*#64663#*#* | - Mobile phones Hardware Test |
| *#*#7780#*#* | - Factory Data Reset (all phone data will be erased). |
| *2767*3855# | - The firmware of the device is completely reinstalled |
| *#*#232338#*#* | - 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#*#* | - Test GPS |
| *#*#197328640#*#* | - Enabling test mode for service activity |
| *#*#0283#*#* | - Packet Loopback test |
| *#0228# | - battery calibration |
| *#*#232339#*#* OR *#*#526#*#* | - Wireless Lan Tests |
| *#*#0*#*#* | - Mobile phone LCD test |
| *#*#3264#*#* | - Ram version |
| *#*#1111#*#* | - FTA Software version |
| *#*#2664#*#* | - Touch-Screen test |
| *#*#0588#*#* | - Test the functionality of your proximity sensor |
| *#*#8351#*#* | - Enables voice dialing logging mode |
| *#*#232331#*#* | - Bluetooth Test Mode |
| *#*#232337#*# | - Bluetooth address |
| *#*#7262626#*#* | - Field test |
| *#*#0289#*#* OR *#*#0673#*#* | - Audio test |
| *#*#0842#*#* | - Backlight/vibration test |
| *#*#2663#*#* | - The displays touch-screen version of Android device |
| *#*#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 | |
| Set up Call waiting | |
| *43# | - Enable call waiting on your phone |
| #43# | - Disable call waiting on your phone |
| *#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 |
| Call Forward All | |
| *21*PhoneNumber# | - Register and activate divert all calls to PhoneNumber |
| ##21# | - Unregister divert all calls |
| *21# | - To turn Divert On for all calls |
| #21# | - To turn Divert OFF for all calls |
| *#21# | - Check status of divert all calls |
| Set up call diversion 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 |
| Set 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 |
| Forwarding in case of "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 |
| USSD Codes For Barring all calls | |
| **330*code# | - Enable Barr all calls on your phone |
| #330*code# | - Disable Barr all calls on your phone |
| *#330*code# | - Check status of barr all calls |
| Set barring of 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 |
| USSD Codes For Barring all outgoing international calls except home country | |
| **332*code# | - To turn Barring On for all outgoing international calls except home country |
| #332*code# | - To turn Barring OFF for all outgoing international calls except home country |
| *#332*code# | - Check status of barr all outgoing international calls except home country |
| USSD Codes For Barring 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# | - Enable Barr all incoming calls on your phone |
| #35*code# | - Disable Barr all incoming calls on your phone |
| *#35# | - Check status of barr all incoming calls |
| USSD Codes For Barring all incoming calls when roaming | |
| **351*code# | - Enable Barr all incoming calls when roaming on your phone |
| #351*code# | - Disable Barr all incoming calls when roaming on your phone |
| *#351# | - Check status of barr all incoming calls when roaming |
| Set barring of 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 |
