FAILURE TO RUN USSD CODES ON GALAXY S20 PLUS 5G

[Jmaps]

Greetings

AM GETTING AN ERROR MESSAGE WHEN TRYING TO RUN USSD CODES AND AM GETTING THE FOLLOWING ERROR "CONNECTION PROBLEM OR INVALID MMI CODE". HOW DO I RESOLVE THIS

[3Fees]

Check with your mobile phone service. Many of the carriers don't support short codes anymore with their software or firmware.

Cheers
3Fees