Block Or Unblock A Phone Number -
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If you block a number on an iPhone, it also blocks their iMessage (they see "Delivered" but you never get it). However, blocking a phone number does not block that same person on WhatsApp, Signal, or Telegram. You must block them separately inside each app. This fragmentation is a security and sanity risk.

* 3. The "Block Evasion" via 67 A savvy caller can dial *67 (caller ID blocking) before your number. Your phone will see "Unknown" or "No Caller ID," bypassing your block list entirely. To stop this, you must enable "Silence Unknown Callers" or use a third-party spam filter. The native block feature has no defense against this. Who is this for? Everyone. If you’ve ever been annoyed by a telemarketer, an ex, or a scammer, this feature is your first line of defense.

You can only block exact 10-digit numbers. You cannot block an area code prefix (e.g., block all numbers starting with 212-555-XXXX). Spammers constantly spoof new numbers, meaning you play an infinite game of whack-a-mole. This is a glaring oversight in 2024.