Is it a scam?
Someone called me from Apple saying someone in another country was trying g to access my account. They said they could help me fix it. I said no thank you and hung up. How likely is this a scam? How can I be certain in the future?
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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
Also, the caller id number shown on scam and marketing calls is frequently not the number actually originating the call. The number is often spoofed.
One option to consider is Settings > Phone > Silence Unknown Callers. See: Detect and block spam phone calls - Apple Support