Icloud
Just got a phone call that my iCloud account had been breached and to call them at a toll free number 315-232-8257. I figure it is a scam but wanted to check.
iPhone 11 Pro Max
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It is a scam. Apple doesn't make unsolicited phone calls. If there was a problem you would be notified when attempting to log in, including when logging into this forum. Also see: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
One option to consider is Settings > Phone > Silence Unknown Callers. See: Detect and block spam phone calls - Apple Support