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Dual SIM support

I have a Sierra EM7565 which has dual SIM support and I would like to somehow use this functionality properly.

I can do something like mmcli -m 0 --command='AT!UIMS=0' to switch sim 0 or 1 but it requires MM to be in debug mode and also it requires me to reset the modem which is clearly not optimal. Also, if I want to add a new bearer it tells me

GDBus.Error:org.freedesktop.ModemManager1.Error.Core.TooMany: Cannot add new bearer: already reached maximum (1)

How could I use two SIMs with MM or NM?

Edited by Bogdan Rădulescu
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