4 Fixes For Connection Problem Or Invalid MMI Code - WirelesSHack

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Restart the Smartphone

If you haven’t already, restarting the smartphone can often get it working again.

The phone may have an error which a restart will often clear when reset.

Clear Mobile Data and Cache

The next option is to clear the mobile data and the cache. This data may have bad information that is causing an error.

Go to Settings–> Applications–> Contacts–> Mobile Data. Clear Mobile Data and Cache Choose the options to Clear Data and Clear Cache.

After clearing the data check to see if the phone works, if not try the next method.

Turn Off One SIM Card

If Available Look in Sim Card Manager If you have a Dual SIM card smartphone turning off the unused SIM Card can often solve the problem.

If available, look inside Sim Card Manager for the options.

Turn off the unused SIM Card and test to see if the error clears. If you are unsure which SIM Card is unused simply test each one, on and off, to see if it works.

Change the Mobile Network Band

Changing the mobile network to another band is a common fix.

Which mobile network will work, depends on the location and will vary.

For example, 5G will work in one location while the older 4G will work in another.

Below are the methods to change the mobile network on Samsung devices and Huawei smartphones.

The location to change the network can vary from phone to phone.

How To Change the Mobile Network Band Samsung Smartphone

Go to Settings
Click Connections
Click Mobile Networks
Change the Mobile Network to another Band. (Often each band is tested to see if the phone works.)

Change Mobile Network