CONNECTION ERROR INVALID MMI CODE

[Billy1]

Morning all....my contract with 3 ends 6/9.

I have bought and installed yesterday a new Global sim from Worldsim. 

Worldsim have confirmed the new profile etc for their sim is set up correctly, but I am CONSTANTLY getting the message

...."CONNECTION ERROR OR INVALID MMI CODE"....any ideas what the problem is?

Could it be anything to do with 3 as their contract has not ended yet?

I have put the 3 sim back in and all seems to be working ok WITHOUT  the recurring message

[PeteG]

Hello, Billy. 

The Global SIM card you've spoke about isn't a Three product or service, so it's difficult to advise on what might be causing the issue. 

MMI Codes are usually referenced when talking about the phone dialer, so I'm guessing it might be something to do with calling, but it's hard to say for sure. I'd recommend trying a reset of the network settings on the device, but do it while the Global SIM card is in the phone so that the phone reconfigures the network settings according to that SIM. 

Hopefully that will do the trick. If you're still having issues after that, it might be worth asking the phone manufacture if there's any specific reasons that message might show up.

Pete.