Adding someone to WhatsApp starts with saving their phone number in your phone's contacts, then opening a chat with them

WhatsApp works through your phone's existing contact list. Before you can message someone on WhatsApp, their number must be saved in your phone as a contact. Once it is, WhatsApp recognizes them automatically. If you want to add someone to a group conversation instead of a one-on-one chat, the process is slightly different — you create or open a group and invite them to join it.

The steps differ slightly depending on whether you use iPhone or Android, but the basic idea is the same: save the number first, then use WhatsApp to start a conversation or add them to an existing group.

Key Takeaways

  • You must save a person's phone number in your phone's contacts before you can add them to WhatsApp.
  • To start a one-on-one chat, open WhatsApp, tap the message icon, and select the contact you want to message.
  • To add someone to a group, open the group chat, tap the group name at the top, scroll to Members, and tap Add Participant.
  • The person you add to a group will see all future messages but not the conversation history from before they joined.
  • You can only add someone to a group if they have WhatsApp installed and you have their phone number saved.

How to add a contact and start a one-on-one chat on iPhone

First, save the person's phone number to your iPhone contacts. Open the Contacts app, tap the plus sign in the top right corner, enter their name and phone number, and tap Save. Make sure you include the country code (for example, +1 for the United States).

Next, open WhatsApp and tap the message icon (it looks like a speech bubble) in the bottom right corner. Tap New Chat at the top. You will see a list of your contacts. Find the person you just added and tap their name. A chat window will open and you can start typing your message.

How to add a contact and start a one-on-one chat on Android

Open your phone's Contacts app and tap the plus sign or Create Contact button. Enter the person's name and phone number with the country code, then save. Open WhatsApp and tap the message icon at the bottom right (or swipe right from the main screen on some Android phones). Tap New Chat or the plus sign. Select the contact from the list and tap to open the chat.

If you do not see the person in your contacts list after saving their number, close WhatsApp completely and reopen it. WhatsApp sometimes needs a moment to sync with your phone's contact list.

How to add someone to an existing group on iPhone

Open the group chat you want to add them to. Tap the group name at the very top of the screen. Scroll down and tap Add Participant. A list of your contacts will appear. Find the person you want to add and tap their name. You can add multiple people at once by tapping each one. When you are done, tap Add in the top right corner.

The person you add will receive a notification that they have been added to the group. They will see all messages sent after they join, but they will not see the chat history from before they were added. This is true even if you add them immediately after creating the group.

How to add someone to an existing group on Android

Open the group chat and tap the group name at the top. Tap Add Participant. Your contacts list will open. Tap the person you want to add — you can select multiple people by tapping each one. Tap the checkmark or Add button to confirm. The new member will be notified and added to the group right away.

If you do not see someone in the contacts list when trying to add them, it means either their number is not saved in your phone or they do not have WhatsApp installed. You can only add people to groups if they are already WhatsApp users.

Creating a new group from scratch

If you want to create a brand new group instead of adding someone to an existing one, open WhatsApp and tap the message icon. Tap New Group (on iPhone) or look for the New Group option (on Android). Select all the people you want to include by tapping each contact. Tap Next or Create, then give the group a name and tap Create Group.

You can add up to 256 people to a single WhatsApp group. When you create a group, you become the group admin, which means you can add or remove members, change the group name and photo, and manage other group settings.

What to do if someone is not showing up in your contacts

If you saved someone's number but they do not appear in WhatsApp's contact list, try these steps. First, make sure you saved their number with the correct country code — WhatsApp requires the full international format. For example, a US number should be saved as +1 followed by the area code and number, not just the 10-digit number.

Close WhatsApp completely and reopen it. Sometimes the app needs to refresh to see newly saved contacts. If that does not work, go to your phone's settings, find WhatsApp, and check that it has permission to access your contacts. On iPhone, go to Settings > Privacy > Contacts and make sure WhatsApp is turned on. On Android, go to Settings > Apps > WhatsApp > Permissions and enable Contacts.

Frequently Asked Questions

Can I add someone to a group if they do not have WhatsApp?

No. WhatsApp only works between people who have the app installed. If someone does not have WhatsApp, you cannot add them to a group or send them messages through the app. They would need to download WhatsApp first.

Will someone see old messages if I add them to a group?

No. When you add someone to a group, they only see messages sent after they join. They cannot see any conversation history from before they were added, even if the group has been going for months.

What if I add someone by mistake?

You can remove them from the group. Open the group, tap the group name, find their name in the Members list, and tap Remove Participant (iPhone) or tap and hold their name and select Remove (Android). They will be notified that they were removed.

Can I add someone if I do not have their number saved?

Not through the normal method. You need their number saved in your phone's contacts first. If you know their number but have not saved it, save it to your contacts, close and reopen WhatsApp, then try adding them again.

How many people can I add to a WhatsApp group?

WhatsApp groups can have up to 256 members. If you need to communicate with more people than that, you would need to create multiple groups or use a different communication method.