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Hi there and welcome
The upgrade carrier settings is normal, it is not something sinister that occurred on the phone. At times the carrier changes their network settings and the phone needs to update this.
The call from your number is ***** a company that spoofed your phone number (faked it), it is easy to do for companies, and they do this regularly.
When you update the carrier details I would advise you to restart the phone. The way to do this is to hold the power and home buttons for about 10 seconds until you see the apple logo then release, then let the phone restart.
But this call your friend received was not related to updating your carrier settings. Having an iPhone allows you to be protected from these sorts of malware.