Often a connection error occurs due to a non-working SIM card. Let's analyze the main ways to solve the problem with MMI. MMI code is executed on mobile devices and tablets, from any operating system. Such combinations of characters are used by users for service operations. MMI code - a request from a mobile device that contains an asterisk and a hash in its symbols. In our article, we will tell you how to do certain manipulations in order to restore the connection. This error can appear when checking the balance on your phone or tablet. Upon attempt phone call or at the time of sending SMS on the phone screen, you can see a message about the connection problem.
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