How can I tell it someone has BLOCKED my number (iPhone 5)?

I got an iPhone 5 ios11 and i don't know if someone in a Samsung phone has blocked my number

1 - I rang them and it went 10 "beeps beeps" before going to answerphone when I thought it just goes to 1

2 - I can still see their WhatsApp profile pic, status and last active and I thought it automatically blocks WhatsApp too but I may be wrong

How can I know for sure?

You don't know for sure

Usually, it's considered not to be of your business to know.

There's only one way to know for sure. You ask the person who you suspect has blocked you and hope they tell you the truth.

If someone isn't responding to your calls or messages then it really doesn't matter whether they've blocked you or not: just take the hint…