How To Fix Connection Problem Or Invalid MMI Code Error On Android (Easy Guide 2026)
How To Fix Connection Problem Or Invalid MMI Code Error On Android
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In this video, I will show you how to fix the “Connection problem or invalid MMI code” error on Android phones. If you’re unable to use USSD codes like *#06# or check your balance due to this network error, this guide will help you resolve it quickly. The invalid MMI code issue usually occurs because of network signal instability, SIM card problems, carrier restrictions, or incorrect dialer settings. I’ll walk you through practical solutions including restarting your device, toggling airplane mode, checking SIM placement, switching network modes, resetting network settings, and testing safe mode. These fixes work for Samsung Galaxy, Xiaomi, Realme, Oppo, Vivo, and other Android devices on any carrier.
00:00 Introduction
00:10 Fix Invalid MMI Code Error
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