Archer MR550 block phone calls on main sim

Hello,
i'm using a ARCHER MR550 with multi sim (dual Sim).
The main SIM is installed in my cell phone,
The second SIM is installed in my Archer MR550.
always if i power up the Archer MR550 my Cell phone is busy. i can not receive calls when the router is powered up.
If i shut down the Archer, all is fine and my Cell phone is ringing.
I believe it is something wrong in the Archer-setup but i don't know.
i have tested with other routers and all is working fine.
Thank you for any idea!
Best regards
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Hi, thank you very much for the feedback.
May I know your SIM carrier?
Would it be possible to contact the SIM ISP to block the calls on the SIM card in the router?
-If it is not an option, there is a beta firmware for Archer MR550, which might help with the current issue. You can find it in the private message,
Thanks a lot and best regards.
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Hi, thank you very much for the feedback.
May I know your SIM carrier?
Would it be possible to contact the SIM ISP to block the calls on the SIM card in the router?
-If it is not an option, there is a beta firmware for Archer MR550, which might help with the current issue. You can find it in the private message,
Thanks a lot and best regards.
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Hi, thanks for your message.
The beta firmware has been shared via Private message.
Best regards.
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