I Must Call AT&T Each Day To Switch Sim Cards Between My Personal Devices.

I use a variety of AT&T-compatible devices, including an Apple iPhone, a Samsung Galaxy, a Google Pixel, and a Motorola Razr. In the past, switching my SIM card between them was all that was necessary to transition between devices without having to contact AT&T for ten years. When I inserted my active, activated sim card into another, it became operational right away. Since late December 2022, whenever I put my SIM card into a different device after it had previously worked in my first, the SIM would not function in the new device I was moving to. Unless I put the sim card back inside the old device and informed AT&T of the switch to the new one, the sim card would not connect to the network or register on it. My AT&T devices are all fully paid for, unfinanced, unblocked, and otherwise in good standing. The phone's (IMEI) number and the AT&T sim card's (ICCID) number are now connected, making it impossible to change the device without contacting AT&T. I now have to phone AT&T everyday at 1(800)901-9878, which is an unnecessary inconvenience. I would need to contact AT&T support if I attempted to switch devices online through the AT&T website since it didn't work. What AT&T could have done differently is to send an automated text message to the device I'm switching to inform me that I've successfully switched my sim card from one device to another and to call AT&T support if I didn't authorize this transfer. Fortunately, I don't need a new SIM card every time I switch devices, but it's still inconvenient to call AT&T everyday. Everything was messed up by the most recent AT&T system update for devices connecting to their network.