We'd be more than happy to take a closer look into why you're unable to make or receive calls on your other cell phone. We'll need some more details in order for us to better assist you. What kind of cell phone are you using? Are you still able to send/receive text messages, and use your mobile data? Did you make sure that you've followed these correct steps to Swap an active SIM card between devices at the link provided? Please let us know. In the meantime, we recommend using our Troubleshoot & Resolve Tool to fix SIM card issues. Simply select your device and the issue, then follow the steps to find a solution. Let us know if this helps.
Sean, AT&T Community Specialist
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