1 Mobile internet doesn't work - help

On my Nothing 4a Pro I use 1 Mobile partner for mobile internet but doesn’t work! I don’t understand.

crstncrgt try resetting network settings and reinsert sim card… try contacting carrier support also…

crstncrgt i think your sim card have some issue you can show or contact sim company for that

I changed the APN and now work! (⁠^⁠⁠)