topic Re: Invalid MMI Codes error in XZ Series

Invalid MMI Codes error

xznewbie — Wed, 08 Feb 2017 04:37:10 GMT

Hello guys, Have anybody encountered this Invalid MMI code error in your Sony Xperia dual SIM..?
How did you resolve it..?

Re: Invalid MMI Codes error

Jonas — Wed, 08 Feb 2017 09:06:48 GMT

Hi @trashcan,

This seems to be related to your service provider (operator).

Do you receive this message when entering a code in the dialer pad to check status on how much data you have left for the month or something similar?

If you are receiving it when entering a code, try putting a "," at the end of the code.

So if the code is supposed to be #*123#*. Try entering the code as #*1337#*,.

If you experience this code in any other way, I would recommend getting in touch with your service provider.

Let me know if that helps!

Re: Invalid MMI Codes error

xznewbie — Wed, 08 Feb 2017 09:58:39 GMT

Hi Jonas.. I did try your suggestion but it did not work.. O have read in the web that this fault is common with dual SIM phones. There are some articles exclusive with Samsung phone but won't work with xz. I was thinking there should be a solution exclusive to Xperia phones.
I did contact my service provider but they were unable to provide viable solutions

Re: Invalid MMI Codes error

Jonas — Wed, 08 Feb 2017 14:47:07 GMT

Hi again!

If it didn't work with the "," I'm afraid that there isn't anything that you can do or change in the phone, since this is an error message from the network.

Do you have another SIM card from the same service provider that you can try with and see if you experience the same behaviour?

If you borrow one from a friend, colleague or similar, or if your service provider has a store where you live, they should be able to replace your SIM card(s).

Keep me posted!

Re: Invalid MMI Codes error

xznewbie — Fri, 10 Feb 2017 09:45:18 GMT

Hi Jonas, I did ask the service provider for assistance and told me to change APN to their recommended settings specific to their Sim card. I made their SIM card as default for this particular service (DATA use). Still the invalid MMI. code and no connection error persist..
Now trying to sort this issue on my part. I looked up service provider settings >mobile network >service providers. As there are two Sim, there should be two service provider. But only one is active with home symbol but the other is zero with a dash across sign. I was wondering this might be the reason as this particular Sim card provider is the problematic one. Is it possible to activate both in the service provider are. I don't understand I had been using both sim card interchangeablly for all purpose, calls, SMS, data until now.
What would happen if I swap the two Sim cards. The #1 card become the #2 and conversely. Would it work and not pose problems..? BTW, the Sim cards are prepaid type so possibly unlocked....? Any ideas what would happen. What are your suggestions to this problem..?

Re: Invalid MMI Codes error

Jonas — Mon, 13 Feb 2017 12:37:10 GMT

Hi again!

If you switch the SIM cards, and do a new network search, is it only showing the networks with a home icon for the SIM card in slot 1 or is does it work correctly with one of the cards?

It's hard to say what is wrong, but these error messages are network related, so my best advice is that you contact the service provider that you experience the behaviour and if they have a local shop in your area they should be able to replace the SIM card or disable and enable it again or if they can send you a new SIM card.

Let me know how it goes!

Re: Invalid MMI Codes error

xznewbie — Mon, 13 Feb 2017 21:39:32 GMT

The concerned service provider already exhausted their efforts in sorting my problem. Besides the SIM card did not exhibit thus problem in other phone. Meaning this is phone problem. How Do I run this experia xz in same mode as I tried shutting the phone down while holding the start button and tapping at the display won't work. I will try doing this in Safe Mode if the same problem occurs.

Re: Invalid MMI Codes error

xznewbie — Mon, 13 Feb 2017 21:41:48 GMT

If this problem persist while in Safe Mode then this is the problem that I bring to the service center.

Re: Invalid MMI Codes error

Jonas — Tue, 14 Feb 2017 12:49:33 GMT

Thanks for the update!

To reboot your phone in safe mode, press and hold the ON/OFF button, until you see the "Power off" menu, press and hold on "Power off" until you see a new window (takes 3-4 seconds) tap OK in the bottom right corner and the phone will reboot to safe mode.

To exit safe mode, simply restart your phone.

If this is indeed caused by the phone, and you experience the same behaviour in safe mode. I'd recommend that you perform a software repair using Xperia Companion before you visit an authorized service centre, just to rule out that this is caused by the software in the phone.

A software repair will delete all data stored on the internal storage, so creating a backup prior to starting with the repair is advised.

Keep me posted!

Re: Invalid MMI Codes error

xznewbie — Thu, 16 Feb 2017 09:47:30 GMT

Actually after the safe mode the situation has improved but there are still issues that I am awaiting to be ironed out by the service provider. So it's not yet completely resolved..

Re: Invalid MMI Codes error

Jonas — Fri, 17 Feb 2017 09:27:45 GMT

Thanks for the update and I'm happy to hear that has been some improvement!

I hope they will resolve this as soon as possible as well, it's never fun to have error messages and not being able to use certain basic functions in the phone.

Keep me posted and have a great Friday and a great weekend!

Re: Invalid MMI Codes error

xznewbie — Thu, 23 Feb 2017 03:07:35 GMT

Update of the this thread... I contacted the service provider and have the SIM card replaced but the fault is still there.they have done many things just to find solution.The fault remains.
Now this lead me to ask questions.Is this fault exclusive to dual sim xz. As this happens with the secondary Sim and never with the primary ones.. Have anyone has an experience in interchanging the SIM card, like Sim card 1 goes to sim card two slot and conversely. . What was the result? Will doing such interchange not screw up the phone software..?
Another question,, is regular swapping of LTE to WALMART between the two Sim card due different signal strength will not gradually impair the SIM or its contact points as well as the phone software for this particular application. What I mean will it not cause permanent damage. I was asking this s as when this xz phone was new and freshly installed with two Sim card, I did not experience this error. Only after a more than a month of regular juggling the function, like call, text and data between the two Sim card did this "connection problem or invalid MMI code arise.

Re: Invalid MMI Codes error

xznewbie — Thu, 23 Feb 2017 03:09:27 GMT

Gosh this SwiftKey is problematic. The statement I meant was LTE to WCDMA.. between the two Sim cards.

Re: Invalid MMI Codes error

Jonas — Fri, 03 Mar 2017 12:28:36 GMT

Hi again!

I am so sorry for the late reply.

It's hard to say what isn't working as it should, the error message is a network error at least.

I checked with a few colleagues of mine that are using Xperia XZ Dual and they haven't experienced the same behaviour and they are switching quite a lot between which card should be used for calling, sending text messages and so forth. This is something that is completely normal for users to do so it should not harm the software in any way.

To be able to rule out that it's caused by your service provider I'd recommend trying 1 or 2 SIM cards from a different operator in your phone, if you can borrow 1 or 2 from a friend and test in your phone. You can also contact your service provider and see if they are able to reset the subscription on both your SIM cards back to default.

Once again, I am sorry for the late reply and for the time it's taking to sort this out.

Keep me posted and have a great weekend!