How to check if someone blocked me on WhatsApp

There are four conditions to know if someone blocked me or not.

First conditions:

See their(the one who blocked you) ” last seen online”. If someone blocked you, you cannot see their “last seen online” any more.

Second conditions:

See the check marks of messages send by you. If someone blocked you, you see only a single check mark instead of two.

Third conditions:

 Their profile pic will not be changed.

Fourth conditions:

You cannot make calls to them using WhatsApp calling feature.

If all the above 4 conditions satisfy with your situation, then you are blocked by someone.