Sony ST21i Xperia Tipo Black "mmi phone code ussd" Questions

...phone always writes me MMI complete, samsung my phone! If someone knows something about it, what is it, please reply to me. thank you! :) If you are using Vodafone network operator, then this article ...

...MMI code. The phone still works perfectly except for this issue. My broadband connection via Wi-Fi is being received strongly by the phone. Does anyone have any idea how to resolve this please? Thank ...

...MMI code" everytime I try to run an USSD command like asking balance due (*999#), etc? I remark also that Sim ToolKit app is not installed on my phone. It's a sky vega im-a810s known also pantech, ...