Android >

This gets to the truly hardcore settings.

• See also Android Developer Mode

• Does not work on Android 12 on the Samsung Galaxy S22 Ultra

  • The alternatives *#446633# and ##197328640## say:
  • When dialled, it says USSD code running and then Connection problem or invalid MMI code. [ 1 ]
  • Check out https://forum.xda-developers.com/t/how-to-enable-all-bands-through-service-menu-on-us-ca-s22-series-including-sub-6-and-mmwave.4488435/
• Not tested on Android 10 on the Umidigi Power 3

• Tested on Android 7 the Doogee X20

1. Phone
2. Dial pad

3. *#*#3646633#*#*

   • Reportedly *#446633# is an alternative.

Footnotes

1. MMI means “Man-machine interface” [ ↩ ]