I'll start with saying I have no idea how to nagivate my way around Winbox and my only knowledge is surface level (changing bands, checking log, reboot/update etc)
Here's the issue I'm having.
I have a mobile data plan which has unlimited data and I bought with it extra SIM cards for the family.
SIM 1 = my own, the base sim for the plan
SIM 2 - wife's sim
SIM 3 - our daughter's sim
SIM 4 - was intended to be used inside the mikrotik chateau to give internet to our computers via ethernet/wifi
SIM 5 - extra unused sim
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Only the "base" SIM (SIM 1) can make/receive calls, but all the SIM cards have access to the internet.
Here's where the problem starts.
All the sim cards connect to the internet and reach 4G+/5G speeds, but only through a mobile device.
My mikrotik chateau connects to the internet as intended, but only when SIM 1 is inside it. None of the other ones work.
By don't work I mean they do connect to the cell and show up as connected in the Cellular tab, leds light up, etc, but they don't give internet to ethernet, nor wifi.
They don't have a PIN, although I don't think that matters because SIM 1, which works fine, does have a PIN and has worked flawlessly for a year now.
I have reached out to the provider's support (Greece, COSMOTE) a few times and they aren't aware of a problem / have a solution. They insist it's the router (which imo is weird because SIM 1 works fine).
Is there some setting I'm overlooking? I really want to be able to use my phone number, since a lot of services send me OTP SMS for authentication (bank for example), plus to make the occasional call as needed. I have to jump through hoops anytime I need something done, like connect the PC through the phone's hotspot and take SIM 1 out of the mikrotik and put it in an older phone..
If anyone has any idea where to start with troubleshooting this, I'd be very grateful!