There are some indications that someone has blocked your WhatsApp number.
One of the features of WhatsApp is the ability for users to block other users' contacts. As such, the contact can't contact you either via chat or phone.
According to WhatsApp, a number of contact indicators have been blocked by users. The company says that the signs can be ambiguous because the blocking process is part of the privacy realm and will not notify users in writing that others have blocked them.
In general, six characteristics of your number have been blocked, here are the signs:
1. Can't See WA Status
The first feature is not being able to see someone's WhatsApp Status. However, there is another possibility that the user is enabling the Status Privacy feature for only a few people.
2. Last Seen Status
A sign that someone is blocked means they can't see the Last Seen feature on a contact. This feature shows when someone is active on WhatsApp.
These characteristics can indicate other possibilities. Users can disable Last Seen to prevent others from seeing it.
3. No Profile Photo
If you don't see someone's profile picture, your contacts may have been blocked by that person. But, there is another possibility that the user has hidden your profile picture or number so that the profile picture cannot be seen.
4. Check One
One of the characteristics of a successfully sent message is two checks in the sent message section. Some people use a blue two-check setup.
If you don't see any of these signs when you send a message, you may have been blocked. However, there is another possibility that the person cannot access the internet or does not have a quota.
5. Can't Be Invited to Groups
If you can't invite someone to a WhatsApp group, you may have been blocked by that person.
6. Can't Make Calls
Contacts that cannot be contacted are characteristics of having been blocked. When called using WhatsApp, the status will be "calling" instead of "ringing".
However, it can also indicate that the middle person does not have an internet plan or is in an area of the network that cannot access the internet.
That's how you can find out WhatsApp is blocked by someone else. Hope it helps.