My Samsung Mobile get Invalid MMI Code How to fix this issue

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Samsung All Phone & J2 - Connection Problem or Invalid Mmi Code Problem Solve: The first way to try to fix an invalid MMI code would be to restart the smartphone. Going to network settings and then holding the #Power” button and the #Home” button at the same time until the phone turns off and starts vibrating will restart the smartphone.
Dial: "*#21#" This code on your phone to fix this problem.
MMI code is the code that we enter over the phone which contains * and hash # characters. Solution: 'Connection problem or invalid MMI code' indicates a problem with the network (i.e poor signal) or wrong MMI code have being entered by the user

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Thank you very I solved my phone A32 Samsung

trytoknowsomething
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طول حياتى مستفتش شئ من اليتيوب ده غير الكود ده الوحيد اللة ظبط معايا تستاهل متابعه

icbkoye
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Yr I love u hogya big fan of you appreciate is very usefull and working trick thank u thank u so mucj

legendroy
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Thankhus .. itni video dakhi kuch smjh ni ai apki video sy masla solve ho gya thanks ❤

noor-eutz
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تستاهل اشتراك ودعم والله انت الوحيد اللي حليت الشغله بالنسبه لي

saalehsalem
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But what is with the Test Codes, for testing the camera, display, ports, sensors etc.? Why do they dont work anymore??

brunobrown
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The only working solution for me.
Thank you.

Poetry_Voice
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Sir jab ma ye code lgata hu Telenor ki sim pr to Kisi bhi cheez ki forwarding nhi Hoti or jab *#67# dial krta hun to voice call forwarding me number show hota ha uss ko hatane ke Liye mene bohot si videos Dekhi aur koi bhi code lgata hun to erase nhi hota Telenor ki sim pr connection problem or invalid MMI code aata ha chahe kahi bahir bhi Chala jaon Kisi AUR sim pr erasure ho jata ha.

Mindset
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What do this fonction means ?
I did *#21#, called, and i had this:
"Call transfer
Without condition
Voice: not transferred
Ok
Synchronous: not transferred
Ok"
> What means all this ?
Thanks

zuccoeur