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Hello,
https://forums.commentcamarche.net/forum/affich-37741089-rond-barre-je-n-arrive-pas-a-l-elever
Meaning of the circle with a line through it on your phone (Samsung circle with line, phone circle with line)
This symbol generally means "No service" or "Emergency calls only." It indicates that your phone is not connected to any cellular network or is not authorized to access one (e.g., SIM card not detected, network unavailable). If you see this symbol on your mobile phone screen, it's a major network connection issue.
https://www.amplificateurlcd.fr/articles/barres-de-reception-sur-un-ecran-de-telephone-portable/