One of the biggest annoyances with WhatsApp used to be that you couldn’t see if a specific phone number was registered with the service unless it was saved in the Contacts app on your iPhone. That changed with WhatsApp version 2.19.30. Now you can easily see if a phone number exists on WhatsApp before sending a message and iDB will show you how.
This feature comes in handy when you want to see if a person whose phone number you know is using WhatsApp or not. Before WhatsApp 2.19.30, you first had to save a number in the Contacts app so WhatsApp could determine if it was on the service.
So the next time you meet someone and get their phone number, you can check if they are on WhatsApp before saving them as a contact. Follow us as we show you how.
How to see if a phone number is on WhatsApp or not
1) Open WhatsApp and be on the Chats Screen. 2) Tap the new chat button from top right. 3) Beat New contact. 
4) Type or paste the full phone number you want to verify.
5) Beat Interrupt To exit this option, or enter a person’s first and last name along with other details before tapping Save on computer (you’ll review contact details on the next screen).
Don’t overuse this feature as WhatsApp refuses to verify new phone numbers after a few consecutive attempts. 
How to check if a number is on WhatsApp or not with Safari
The above method is very simple, but you should also know a second method.
1) Open Safari and type in the address bar https://wa.me/ followed by the country code and the phone number you want to check. wa.me is the official short URL for WhatsApp. For example if you want to check 987654321 is available or not on WhatsApp, enter the following: https://wa.me/+1987654321. +1 in this case is the country code (for the USA).
2) When you’ve entered everything, tap the Enter key on the keyboard.
3) You will see a popup that says Open this page in WhatsApp? Beat Open minded.
4) If the phone number is not registered with WhatsApp, it will say: “The phone number is not on WhatsApp.“
5) If the number is registered with WhatsApp, the chat screen will open. You can start a chat with that person (without saving the number!) or go back to exit the screen.
More WhatsApp tips:
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