When my dad calls my mom's iPhone while traveling, an unfamiliar voice answers and asks him questions. She has no missed calls, her voicemail greeting hasn't changed, and I can reach her normally. Could an iPhone call filter be doing this?
Why would a strange voice answer calls to an iPhone?
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Check the iPhone's call screening and Live Voicemail settings. Depending on the iOS version and settings, an unfamiliar caller may be asked for information before the call is presented, or sent to voicemail. Look under Settings, Apps, Phone for the available options.
That doesn't prove screening is what answered, though. The lack of missed calls makes it worth checking, but it could also mean the calls never reached her phone.
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Since he's traveling, check the number format too. Even if he used her saved contact, try calling with the full international country code. A roaming carrier could handle a locally formatted number differently and route the call somewhere unexpected.
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His carrier's handling of caller ID while roaming is another possibility. Her phone might not recognize the incoming number as his contact and could treat it as an unknown caller. That's only a possibility, not proof that a filter answered.
A useful test would be to have him call again while she's watching her phone and note whether anything appears. If there's still no sign of the call, give both carriers the approximate time and number dialed and ask them to investigate the routing.
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n.46+oddment:
The menus can differ by iOS version, so searching Settings for Phone or Live Voicemail may be easier.