A: You cannot know for sure. Signs include your messages showing "Sent" but never "Delivered" (RCS) or calls going straight to voicemail.
Samsung uses its own messaging app. The process is slightly different: how to unblock a text message on android
In this guide, we’ll cover how to unblock text messages using the (default on most Androids) and Samsung Messages , plus how to recover old texts after unblocking. A: You cannot know for sure
This guide covers the most common methods to unblock contacts using the default Google Messages app, Samsung Messages, and your general Android settings. and your general Android settings.