on this post, we will discuss common causes of Connection Problem Or Invalid MMI code on android smartphone and the best ways to solve this USSD error, if read this post thoroughly you will be able to identify the cause this errors, and how you can fix with ease.
USSD codes are the mobile network provided codes which we utilize to get some information about our android device or sim card, these codes are commonly used to check data balance, airtime balance, device IMEI number etc, but sometimes we find it hard using this USSD code due to the Connection Problem or Invalid MMI pop up, many factors can be responsible for this error popup, we will highlight them on this post.
Causes of “Connection Problem or Invalid MMI code” on android and solutions
1~ Invalid IMEI: The Invalid MMI code errors can be as a result of your android smartphones null or invalid imei that’s the, to solve this problem first check if your device IMEI is valid by dialing *#06# if you did not see the 15digit IMEI number then you will need to fix the issue asap, follow the instructions on this post to change your device IMEI without pc
2~ 4G/LTE only Network settings: settings your device to 4GLTE only network mode is one of the major causes of connection problem or invalid MMI on android sometime ago we shared an article on how to force 4G network only mode on your Android smartphone, well if you must set your network to that mode set it only on sim card you don’t receive calls on, because 4G only mode will set your smartphone to auto reject calls and equally cause “invalid MMI code” error, to solve this issue kindly go back to the MTK tool under network select, set your sim network mode to AUTO(4G/WCMA/EDGE)
3~ Lack of network Signal: The invalid MMI code errors can equally be as a result of non availability of 2G/3G/4G network connectivity in your area or location, if you have low network signal on your Android smartphone and the invalid MMI problem occurs anytime you dial a USSD code on your Android smartphone, to solve this problem you have to change location.
Those are the major causes of “connection problem or Invalid MMI code issues” on android smartphone, and their solutions,
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