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kindly explain to me how the dual sim works. is there a way to have them both active and tramsmiting data?but mainly how to switch sims remotely..by sms command maybe?

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Hello.

Both SIM cards are active and device selects SIM using special algorithm.

Please visit Teltonika Wiki for Dual SIM description:

https://wiki.teltonika-gps.com/view/FMB125_GSM_Operators_settings

Regards