@Daskemann Hello, the data usage is only working when the MR200 works as a 3G/4G router mode, as we assume it is not that necessary to monitor the data usage when using as a wireless router.

@sasmrj Hello, thanks for asking. Please get the beta firmware of the band selection from the below thread: https://community.tp-link.com/en/home/forum/topic/166506

@C4SG Hello, thanks for asking. Please refer to the guide below to check the DDNS settings on the MR6400 again, ensure the connection status is RUN: https://www.tp-link.com/support/faq/1682/ BTW, it...

@ManojSaini1990 Hello, it seems the SIM card slot might be faulty, you may contact the local tech support or reseller to request a replacement:...

@rowenainop Hello, may I know where are you located? Who is your SIM provider? Insert the SIM card, then reboot the MR600 and observe. Try to reset the MR600 to its factory by holding the reset...

@Ibrahima Hello, the data usage is only working when the MR600 works as a 3G/4G router mode, as we assume it is not that necessary to monitor the data usage when using as a wireless router.