Hello! I understand your concern about the U Mobile coverage in Langkawi. The scheduled maintenance on 12 and 13 March might be causing the fluctuations in your service. During this period, some areas may experience disruptions in voice and data services. I recommend checking the U Mobile official website or social media for real-time updates on service status. If the issue persists beyond the maintenance period, you can try restarting your device or contacting U Mobile customer support for further assistance. Thank you for your patience!