MMI codes let you access several interesting things on your smartphone – ranging from your IMEI number and SAR values to hidden menus that are generally used by smartphone engineers and repair services.įor example, several smartphones let users type in an MMI code and let them access a 'test’ menu. MMI CodesĪs for MMI codes, these are part of something known as the Man-Machine Interface schema and are generally specific to a smartphone brand or model. You will need to contact your carrier for the ones relevant to you. USSD codes are typically carrier-specific and will differ from one carrier to another. While these are still used by smartphone enthusiasts, USSD codes have largely fallen out of favor among general users because most carriers have their own app/website where most of this information could be easily accessed. They were also helpful in letting you know about the data usage and prepaid balance and accessing a whole lot of carrier-specific information. In the past, USSD codes were used to start/stop specific value-added services. This also means that you almost always need to be connected to your carrier for USSD codes to work.
USSD stands for Unstructured Supplementary Service Data, and these codes are typically used to communicate between your smartphone and your mobile network operator. So if your phone doesn't respond to a code, don't dwell on it, just move on and find another one. It's important to note that some codes are carrier-specific, so they won't work on all devices. The code entry procedure is very simple and only requires you to bring up your dialer keypad and enter the appropriate number sequence.
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These codes are updated regularly as new versions of Android software are released, and some manufacturers have their own additional special codes. Both USSD and MMI codes usually begin with an asterisk or a pound symbol/hashtag.
While the average user might not even need to know the difference between these two, it is always good to know what the differences are.
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