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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




HTC U21 smartphone runs on Android v10 (Q) operating system. The phone is powered by Qualcomm SDM765 Snapdragon 765G (7 nm) processor. It has 8 GB. Internal storage options which can be extended with the help of 256 GB. The smartphone has a IPS LCD providing. The smartphone is fueled with a 5000 mAh. The sensors include Accelerometer, Gyro, Proximity, Compass, SAR. Connectivity features in the smartphone include Bluetooth, A-GPS, Glonass, NFC and more. The HTC U21 are available in various colors such as Green, White.

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


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.



User questions and comments about secret codes HTC U21



userQlbanedMarch 30, 2024
The Android v10 operating system provides a smooth user experience with excellent performance. The camera takes high-quality photos, and the battery life is impressive. Great value for money.
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