You can block or unblock a number on an Android phone using the built-in Phone app's "Blocked numbers" menu.

You can't know for sure if someone has blocked you on an Android without asking the person, but there is a method you can use ...

When you call someone, you usually want them to know who you are. Usually. On the flip side, there are times when you might want or need to hide your phone number from the person on the other end of ...