Just like USSD, you have to dial the "hidden" codes on the stock dialer app to invoke the corresponding action. While USSD codes are used to communicate with the mobile network operator's servers for menu-based information services, mobile-money services, and location-based content services, the MMI Supplementary Service codes work completely offline. It is possible to customize the quick menu by overriding the default menu resource XML files, or by creating your own. If you already see a Device controls control in one of the first four spots in that menu, you’re all set. The message is terminated with a hash symbol (#), but custom MMI codes may end with an asterisk as well. Swipe down twice from the top of your screen to open up the full Quick Settings area. To add a setting, drag it up from 'Hold and drag to add tiles.' To remove a setting, drag it down to 'Drag here to remove. Groups of digits may be separated by additional asterisks. From the top of your screen, swipe down twice. These are a bit different from the Unstructured Supplementary Service Data (USSD) codes, although both of them start with an asterisk (*) followed by digits that consist of commands or data. The so-called hidden codes are basically part of the Man Machine Interface (MMI) schema. Give them a try and discover some of the handiest secret functionalities of your phone. Swipe down from the top of the phone to reveal the quick settings menu. Below you can find a bunch of generic and device-specific Android hidden codes. Search Close GO Mobile Phones > Android How to Customize a OnePlus 9 Phone.
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