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HTC U21 secret codes


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HTC U21


OS: Android v10 (Q)

CPU: Qualcomm SDM765 Snapdragon 765G (7 nm)
RAM: 8 GB
Display: 6.8 inches
Battery: 5000 mAh






Secret codes for HTC U21

*#06#- IMEI (International Mobile Equipment Identity) number
*#*#3424#*#*- Engineering Mode
*#*#3646633#*#* or *#*#54298#*#*- Engineering Mode (for smartphones based on MTK processor)
*#*#4636#*#*- Displaying Phone Information (Phone, Battery, WiFi and other)
*#*#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
*#12580*369#- Software and hardware info
*#0283#- Audio Loopback Control
#7465625*638*#- Insert Network Lock Key Code
*#*#759#*#*- RLZ Debug UI (Device ID, Activation Status, Some Ping Stuff, and few other things)
*#*#36245#*#*- Email debug information
*#*#8255#*#*- Used to launch G Talk Service Monitor
*#*#64663#*#*- Hardware Test (Version, Sensors, Sim, WLAN, Bluetooth, Battery, OTG, Radio, Speakers)
*#*#7780#*#*- Used for a factory data reset.
*2767*3855#- Complete wiping of your mobile
*#*#232338#*#*- Displays Wi-Fi Mac-address
*#*#34971539#*#* or *#34971539#- Shows complete 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#*#*- 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#*#*- Proximity sensor test
*#*#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
*#*#4986*2650468#*#*- PDA, Phone, Hardware, RF Call Date firmware info
*#*#8350#*#*- Disables voice dialing logging mode
*#*#2222#*#*- FTA Hardware verion


GSM codes for HTC U21



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#- Activate call waiting
#43#- Deactivate call waiting
*#43#- Check status of call waiting
USSD 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#- 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"
**61*PhoneNumber#- 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"
**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
Diversion 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
Set barring of 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
Blocking all calls
**330*code#- Activate all calls barring
#330*code#- Deactivate all calls barring
*#330*code#- Check status of barr all calls
USSD Codes For Barring all outgoing international calls
**331*code#- To turn Barring On for all outgoing international calls
#331*code#- To turn Barring OFF for all outgoing international calls
*#331*code#- Check status of barr all outgoing international calls
Activate barr all outgoing international calls except home country
**332*code#- 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
*#332*code#- Check status of barr all outgoing international calls except home country
Blocking all outgoing calls
**333*code#- To turn Barring On for all outgoing calls
#333*code#- To turn Barring OFF for all outgoing calls
*#333#- Check status of barr all outgoing calls
Set barring of 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
Blocking 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
USSD Codes For Barring all incoming calls
**353*code#- Activate Blocking all incoming calls
#353*code#- Deactivate Blocking all incoming calls
*#353#- Check status of Blocking all incoming calls


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