How to Fix Connection Problem or Invalid MMI Code?
If you cannot make any calls or send texts on your Android device, then it must be due to some connection or the invalid MMI code issues. MMI code issues happen for several reasons like weak carrier providers, SIM authentication, incorrect position of the characters, etc. So, here are some instructions to fix this error. Reboot the System Press and hold the Power key on your device. Then you will see some options and select the Restart option to reboot the device. Now, check if the problem has been resolved. Attempt Restarting to the Safe Mode You should long-press the power key on the phone. Thereafter, select the Restart option from the options. On the screen, you will view a prompt asking you whether you would like to restart to the safe mode and then choose the OK button. The device will be booted to the Safe Mode. Activate the SMS and Radio over IMS You should invoke the dial pad then input ‘*#*#4636#*#*’ into it. Then you don’t regularly require to hold the send button as it will...