How to know if someone has saved your number?

One way to check is by sending a WhatsApp message to the person. If you see a single grey tick, it means the message has been sent but not delivered, possibly because your number isn't saved in their contacts. A double grey tick indicates the message was delivered, suggesting your number might be saved.

Another method is to call the person. If the call goes through without any issues, it's likely they've saved your number. However, if the call doesn't connect, it could mean your number isn't saved.