I’ve had this problem too. Lockdown mode has blocked calls from people less than an hour after interacting with them on the phone. In some cases I asked callers if they called when my phone said lockdown mode blocked their call and they said no.
We’ve also had a ticket open with apple support for over a year with no follow up about lockdown mode disabling call notifications on apple watch until the caller hangs up. It doesn’t seem like lockdown mode is a priority project with apple. So few people use it in comparison to all iphone users. Communication with tech support or in community has been a waste. No official bug reports posted or follow ups.
If tech support agents at apple don’t understand lockdown mode and if nobody is tracking bugs and providing feedback to users, lockdown might as well be a smoke screen causing frustration in exchange for a benefit that’s not really there - better security. Does it do anything beyond “appear” more secure? We can’t even see metrics showing if or when lockdown mode ever blocked malware or a virus. We just see it block calls from people we trust.
They should provide options out of the box that at least help mitigate some attacks via text message by allowing users to block attachments and the ability to disable live links and instead show full url and force users to copy paste in browser if they trust it like they do in lockdown mode, or disable text that come from unknown email addresses and or short code numbers. This way we don’t end up with a phone blocking calls from trusted contacts.
Security problem have become ridiculous across the board. Working in IT, the number of people i’ve had report someone had access to their text message content, photos and location without ever having physical access to their phone is overwhelming. Previously you needed skill to create or deploy malware. You even needed to jailbreak a phone. Not anymore. From ~2018 to now, online tools have rapidly lowered the bar to effective cyber attacking.
If apple prioritized user security over features and convenience we’d be in much better shape. The allusion is all thats prioritized. iphone doesn’t appear anymore secure to me than android or windows phone.