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MACHINE TRANSLATION:
After updating to IOS 18.6.2, text SMS messages stopped coming, or come with a delay of 3-4 hours. You have to pull out the SIM card or restart the phone every day, that's the only thing that helps.
Have you restarted the phone?
My first thought is "carrier issue." If restarting does not help, I suggesting asking yout you cellular carrier examine and run diagnostics on the phone.