Yes – from Recents or Messages as shown above.
Here’s a helpful guide to managing blocked numbers on an iPhone, covering how to block, unblock, and find your block list. You can block calls, messages, and FaceTime from any number or contact. blocked numbers on iphone
No – existing conversation history stays unless you delete it manually. Yes – from Recents or Messages as shown above
Not directly. They just get sent to voicemail or no answer. covering how to block