You add someone to iMessage by starting a conversation with their phone number or Apple ID

iMessage doesn't have a separate "add contact" step the way some apps do. Instead, you start a message with someone, and they appear in your conversation list. If you want them in your phone's main contacts app so you can reach them across all your messaging and calling apps, you add them there first — then iMessage will recognize them automatically.

The simplest path: open the Messages app, tap the compose button (pencil and paper icon), type their phone number or Apple ID email address, and send a message. They'll appear in your chat list from then on. If you want their contact saved in your phone's Contacts app instead of just in Messages, that's a separate step in the Contacts app itself.

Key Takeaways

  • You can message someone in iMessage using their phone number or the email address linked to their Apple ID without adding them to your phone's contacts first.
  • To save someone permanently in your phone so they appear across all apps, add them in your Contacts app, not in Messages.
  • iMessage automatically detects when someone has an Apple ID and switches from SMS to encrypted iMessage for that contact.
  • If a message shows as green instead of blue, the recipient either doesn't have iMessage or you're messaging a non-Apple device.

Starting a message with a phone number or email

Open Messages and tap the compose icon in the top right (it looks like a pencil writing on paper). A text field will appear that says "To:". Type the person's phone number or the email address connected to their Apple ID. As you type, your phone will suggest contacts that match — tap the right person if they appear.

Once you've entered their number or email, type your message and tap Send. That person will now show up in your Messages list, and you can message them again by tapping their name. This works whether or not they're saved in your phone's Contacts app.

Saving someone in your phone's Contacts app

If you want the person saved so their name appears everywhere on your phone — in Messages, Phone, Mail, and other apps — you need to add them in Contacts, not in Messages. Open the Contacts app, tap the plus sign in the top right, and fill in their name and phone number or email address. Tap Done.

Once they're in Contacts, iMessage will recognize them by name in your Messages list instead of showing just a number. If they have an Apple ID, iMessage will automatically use the encrypted iMessage protocol for messages to them (you'll see a blue message bubble instead of green).

The difference between iMessage and SMS

When you send a message to someone, iMessage tries to deliver it using Apple's encrypted system. If it succeeds, the message bubble appears blue. If the person doesn't have iMessage — because they use Android, an older iPhone, or have iMessage turned off — the message falls back to SMS (standard text message) and appears green.

You don't have to do anything differently. iMessage handles the switch automatically. But if you see green bubbles consistently with someone, it means they're not receiving the encrypted iMessage version, and your message is going through your phone carrier's network instead of Apple's servers.

Adding someone from a received message

If someone messages you first, you can add them to Contacts directly from the conversation. Open the message thread, tap their name or number at the top of the screen, then tap "Add to Contacts" (or "Create New Contact" if they're not already there). Fill in their name and any other details you want to save.

This is often faster than opening Contacts separately, especially if you receive a message from someone new and want to save them immediately.

What to do if someone isn't showing as iMessage

If you're messaging someone with an Apple device but their messages appear green instead of blue, a few things could be happening. They might have iMessage turned off in Settings > Messages > iMessage. They might be using a phone number that isn't registered with their Apple ID. Or there could be a temporary connection issue.

You can ask them to check Settings > Messages and make sure iMessage is on, and that their phone number is listed under "You can be reached by iMessage at". If they've recently switched from Android to iPhone, their Apple ID might not be fully synced yet — waiting a few hours or signing out and back into iMessage sometimes fixes this.

Organizing conversations with groups

If you want to message multiple people at once, tap the compose button and add several phone numbers or email addresses in the "To:" field, separated by commas. iMessage will create a group conversation. Everyone in the group will see all messages and can reply to the whole group or to individuals.

You can name the group by opening the conversation, tapping the group name at the top, and selecting "Edit Name and Photo". This name appears only on your phone — it doesn't change what the group is called for other members.

Frequently Asked Questions

Do I need someone's Apple ID to message them on iMessage?

No. You can message anyone with a phone number using iMessage. If they have an Apple ID linked to their phone number, iMessage will use the encrypted protocol. If not, the message sends as a standard text. You only need their Apple ID email if that's the only contact information you have.

Can I message someone on iMessage if they don't have my number saved?

Yes. They'll receive your message whether or not they have you in their contacts. If they don't have you saved, your message might appear as coming from a number rather than your name, but the message still arrives and they can reply.

What happens if I message someone who has iMessage turned off?

Your message will send as a green SMS text instead of a blue iMessage. It will still reach them, but it won't be encrypted and won't have iMessage features like read receipts or typing indicators. They'll receive it like a regular text message.

Can I add someone to iMessage without adding them to my phone's contacts?

Yes. You can message anyone by typing their phone number or email in the "To:" field without saving them in Contacts. They'll appear in your Messages list, and you can message them again anytime. Adding them to Contacts is optional and just makes their name appear instead of their number.

Why does iMessage sometimes say "not delivered"?

This usually means the recipient's phone was off, out of service, or not connected to the internet when the message arrived. iMessage will try to deliver it again when their phone comes back online. If it stays undelivered for hours, check that you have their correct number or email address.