[Question]: I can't send SMS messages using the RTU5023 mobile app?
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[Question]: I can't send SMS messages using the RTU5023 mobile app?
 [Question]: I can't send SMS messages using the RTU5023 mobile app?
 [Answer]: Please confirm whether your mobile phone has SMS permission to this mobile phone app. (General mobile phone steps: Settings - Application and Notification - Rights Management - find the APP - select SMS permissions)