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Can you try your Sim Card in another phone as a process of elimination to rule out the phone or sim card that may be at fault.
You could try a factory reset but please make a backup first to preserve the data in the phones storage memory.
Also try texting WEB to 40127 which may help.
Current Phone >
Samsung Z Fold³ 5G.
Previous Phone >
Samsung Note 20 Ultra 5G - SM9860.