Sending SMS from MR6450 or MR6500.

I am another unlucky owner of a Netgear Nighthawk M6 Pro MR6500 modem, who can't use it because Netgear removed the function of sending SMS messages (the Nighthawk I purchased last year allowed me to send SMS messages). This functionality is absolutely needed with many mobile service providers (such as Moj Telekom in Croatia) for the primary function of this ostensibly top-of-the-heap modem - the SIM card in the modem needs to be managed in various ways, including extending the subscription, by sending SMS messages to the service provider. How could Netgear possibly remove this critical functionality! I sure hope it is back with a firmware upgrade sooner than I can replace my modem with another one.