LG K8 call waiting error
SOURCE: how to solution for Connection problem or invalid mmi code in samsung GT-19070?
Hi Mohammad, try a Factory Reset.
You need to take it to a store from your cell phone provider.
SOURCE: I always have problem loading airtime on LG705
You have a service provider problem. Call your provider and ask for tech support or go into a store who is an authorized service dealer.
SOURCE: How do I fix a problem with my phone, it displays "Connection Problem/ Invalid MMI code"
www.technobezz.com/fix-connection-problem-invalid-mmi-code/
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