You may need to contact your mobile network provider customer services to ensure there isn't any issue with your actual account @Ozzy32
I don't think a software update would start stopping such connections.
Although it wouldn't harm to take a look in your phone apps settings anyway.
I wish you all the best with this.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.