I had this problem… My SMS messages were delayed for up to 24 hours. I’m running an iPhone X with iOS 15.5. I had already tried rebooting my phone, and reseating my SIM card. I called T-Mobile technical support, and she had me “Reset my Network Settings” on my iPhone, and things started working again. Warning, the steps below will require you to re-login to your WiFi network(s) and reconnect any Bluetooth devices. Here’s how she “Reset my Network Settings”:Go to Settings > General > “Transfer or Reset iPhone” (at the bottom). Select “Reset”, then pick the 2nd option… “Reset Network Settings”. The phone will reboot, and then you’re ready to go! Good luck!
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