1. Nephry's Avatar
    Hi , I'm Nephry and I live in Haiti , and I 'm new to this forum.
    I have a problem with my Samsung Galaxy Note 4 .
    We just send me the USA , I can not make calls , I can't receive , if I want to check my account ca told me all the time ('connection problem or invalid mmi code') and i dont know how to fix it. please help me guys.
    I use the Digicel network .
    Thank you
    10-26-2015 10:33 AM
  2. B. Diddy's Avatar
    Welcome to Android Central! What's the exact model number of your Note 4? Look in Settings>About Phone. We need to make sure that specific model is compatible with your carrier.
    10-26-2015 04:12 PM
  3. Nephry's Avatar
    Galaxy Note 4
    Model ; SM-N910C
    Android version 5.1.1
    kernel version

    PS : if this model is not compatible with my carrier, what can i do to fix this?
    10-27-2015 05:10 PM
  4. Nephry's Avatar
    10-27-2015 05:12 PM
  5. B. Diddy's Avatar
    Go to Settings>More Networks>Mobile Networks, and look for a Network Operator option. Can you choose the correct network there?
    10-27-2015 06:27 PM
  6. Nephry's Avatar
    yes , I can choose the network correctly. before I thought it was a problem of simlock but it was already from the USA ... unlock sim card mache although the bar is full range ... but I can not make calls or to receive .. . if I want to check my account he gives me all the time what kind of message :'connection problem or invalid mmi code'
    10-28-2015 11:00 AM
  7. B. Diddy's Avatar
    See if this article helps: 6 Ways How To Fix Connection Problem or Invalid MMI Code
    10-28-2015 12:22 PM
  8. Nephry's Avatar
    I tried but nothing works, there is no other way you please
    10-28-2015 03:14 PM
  9. B. Diddy's Avatar
    Here's another article, with some of the same tips, and one or two different ones http://recomhub.com/blog/how-to-fix-...amsung-device/ You can find more articles by searching for "invalid MMI code."
    10-28-2015 05:12 PM

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