I need to know which sim is which number, then i will relabel them
I guess you know both numbers.
Go to the app Settings
Go to Network and Internet
Go to SIMs
Disable the first SIM
and leave the second SIM enabled.
Try to send an SMS. If you succeed then this is the second SIM
If you can’t send a SMS then this is the first SIM.
I don’t know if it is possible to rename them.
You should be able to check the number in the settings under “about the phone” click on the SIM if not directly visible at the top.
To rename go to settings - network select the SIM rhere should be a pencil somewhere