The basic way to add a contact on WhatsApp

To add someone on WhatsApp, you need their phone number. Open WhatsApp, tap the button to start a new chat (a pencil icon on iPhone, a plus sign on Android), type or paste their full phone number with the country code, and tap the green checkmark. If that person has WhatsApp installed, their name will appear and you can send them a message.

The country code matters. If you are in the United States and want to add someone in Canada, you type +1 followed by their 10-digit number. If you are adding someone in India, you type +91 followed by their 10-digit number. WhatsApp will not find the contact if the country code is wrong or missing.

You do not need their permission to add them. They will not get a notification that you have added them until you send a message. Once you send that first message, they will see it in their chat list and can choose to reply or block you.

Key Takeaways

  • You need someone's phone number with the correct country code to add them on WhatsApp.
  • The person will not know you have added them until you send a message.
  • If someone has blocked you, you can still add them to your contacts, but your messages will not be delivered.
  • WhatsApp syncs with your phone's contact list, so adding them to your phone's contacts first makes the process simpler.

Adding someone from your phone's contact list

The easiest way is to add the person to your phone's contacts first, then open WhatsApp. WhatsApp automatically scans your phone's contact list and shows you which people already have WhatsApp. You will see a list of contacts with a green WhatsApp icon next to their names. Tap any of them to open a chat.

This method works the same way on both iPhone and Android. Your phone stores the contact with their name and number. WhatsApp reads that information and matches it to its own database of phone numbers. If the person has WhatsApp, they appear in your WhatsApp contact list automatically.

What happens when you message someone for the first time

When you send your first message to someone, WhatsApp sends it to their phone number. They will see your message in their chat list, but they will not see your name unless you are already in their phone's contacts. If you are not in their contacts, the message will show as coming from your phone number only.

This is why adding yourself to someone's contacts before messaging them is a good idea — they will see your name instead of just a number. However, you cannot add yourself to someone else's phone. You can only ask them to add you, or send them a message and hope they save your number.

Once they reply to your message, you are both in each other's chat history. If they delete the chat, they can still see your messages if you send another one later.

Adding someone when you do not have their number

If you know someone but do not have their phone number, you cannot add them directly on WhatsApp. You will need to get their number through another method first — ask them in person, over email, through social media, or through a mutual contact.

Some people share their WhatsApp contact through a link or QR code. If someone sends you a link that says "Click to chat with me on WhatsApp," tapping it will open WhatsApp and start a chat with them. You can also scan someone's WhatsApp QR code using your phone's camera or WhatsApp's built-in scanner — tap the plus sign or pencil icon, look for "Scan QR code," and point your camera at their code.

Privacy and what the other person can see

When you add someone on WhatsApp, they cannot see that you have added them unless you message them. They also cannot see your phone number just because you have theirs — they only know your number if you already had contact with them or if you told them.

However, once you message them, they can see your profile picture, your status, and whether you are online (unless you have changed your privacy settings). Your last seen time is visible to them by default, though you can turn this off in Settings under Privacy. You can also hide your profile picture and status from specific people or from everyone.

If you do not want someone to contact you, you can block them. A blocked person cannot see your last seen time, profile picture, or status. Their messages will not show up in your chat list, and you will not get notifications from them. However, they can still send messages — the messages just will not be delivered to you.

Troubleshooting: When someone does not appear in your contacts

If you type a phone number and WhatsApp does not show a contact, it usually means that person does not have WhatsApp installed, or they have it installed on a different phone number. Try double-checking the number, including the country code. A single wrong digit will prevent WhatsApp from finding them.

If you are sure the number is correct, wait a few hours and try again. Sometimes WhatsApp's servers take time to sync. If the person recently installed WhatsApp, it may take a few hours for them to appear in your contact list.

If you added them to your phone's contacts but they still do not appear in WhatsApp, try opening WhatsApp, going to Settings, and tapping Contacts. On some phones, you may need to refresh your contact list or give WhatsApp permission to read your phone's contacts. Check your phone's Settings app under Apps or Privacy to make sure WhatsApp has permission to access your contacts.

Adding someone in a group chat

You can also meet someone through a WhatsApp group. If you are both in the same group, you can tap their name in the group member list and start a one-on-one chat with them. This does not require you to know their phone number — WhatsApp already has it from the group.

If you want to add someone to a group you are in, tap the group name at the top, scroll down to Members, and tap Add Participant. You will need their phone number to add them. Once you add them, they will see all future messages in the group, but they will not see messages sent before they joined.

Frequently Asked Questions

Can someone tell if I have added them on WhatsApp?

No. They will not know you have added them until you send a message. Even then, they will only see your message — they will not get a notification that you added them to your contacts.

What if I add someone and they have not installed WhatsApp yet?

WhatsApp will not find them. If they install WhatsApp later on the same phone number, they will appear in your contact list the next time WhatsApp syncs with your phone's contacts. You can message them then.

Do I need to ask permission before adding someone on WhatsApp?

No. You can add anyone whose phone number you have. However, they can block you after you message them, and you will not be able to contact them again.

Can I add someone if I only know their username?

No. WhatsApp does not have usernames like Instagram or Twitter. You must have their phone number. If someone gives you only a username, ask them for their phone number instead.

What happens if I add the wrong number by mistake?

If you message the wrong number, that person will see your message. You can delete the message from your chat, but they will still see it on their phone. The best approach is to send a follow-up message explaining the mistake and then delete the conversation.