iMessage Download and Sign In: What to Know

iMessage is not an app you download. It is a feature built into the Messages app that already ships on every iPhone, iPad, and Mac, and searching the App Store for it will not find it.

What you actually do is turn it on and sign in. That takes one switch in Settings and an Apple Account, which is the account name Apple now uses for what used to be called an Apple ID.

Where do I find iMessage if it is not in the App Store?

Open the Messages app. It is the green icon with a white speech bubble, and it is installed by default. If it is missing from your home screen, swipe down on the home screen and search for Messages; it may have been moved into a folder or into the App Library.

If Messages was deleted, you can reinstall it from the App Store, because Apple's own built-in apps are listed there for reinstallation. That is the only case where the App Store is involved at all.

How do I turn on iMessage and sign in?

1. Open Settings on your iPhone or iPad.
2. Scroll to Apps, then tap Messages. On older versions of iOS, Messages sits directly in the main Settings list.
3. Switch iMessage on.
4. If you are asked to sign in, enter your Apple Account address and password. If you are already signed in on the device, it uses that account automatically.
5. Wait. Activation can take a few minutes and the switch will show Waiting for activation until it finishes.
6. Open Send and Receive and check which phone number and addresses are listed. Tick the ones people use to reach you.

On a Mac, open the Messages app, choose Settings from the Messages menu, open the iMessage tab, and sign in with the same Apple Account. Messages will not sync between devices unless the account matches exactly.

Can I get iMessage on Android or Windows?

No. iMessage runs only on Apple devices, and there is no official Android app, no official Windows app, and no web version. Anything advertising itself as iMessage for Android is not from Apple, and installing it puts your Apple Account credentials somewhere they should not be.

If you are on Android and messaging an iPhone user, your messages travel as ordinary texts or as RCS, a newer messaging standard that Apple devices now support. RCS gives you typing indicators, read receipts, and better quality photos across the two platforms, without either side installing anything.

Why does my iMessage say Waiting for Activation?

Activation needs the device to reach Apple's servers and confirm your phone number, and it fails for a small set of reasons.

• No working data connection. Activation needs mobile data or Wi-Fi, and it will not complete on a phone in airplane mode.
• The date and time on the device are wrong. Set them to update automatically.
• The SIM is not active yet on a newly ported number.
• Your carrier plan blocks the short confirmation message the device sends during activation.
• You are signed in to a different Apple Account than the one you expect.

The standard fix sequence is: switch iMessage off, restart the phone, confirm you are online, then switch it back on. If it still hangs, sign out of your Apple Account in Settings, restart, and sign back in.

What do I do if my messages send as green instead of blue?

Green means the message went as a standard text or RCS rather than as an iMessage. That is normal and expected when the other person is not on an Apple device. It is worth investigating only when a person who normally shows blue suddenly turns green.

1. Check that you have a data connection. Without data, iMessage falls back to text.
2. Confirm iMessage is still switched on in Messages settings.
3. Check that the contact you are messaging uses the same address or number their iMessage is registered to.
4. Consider that the other person may have switched to a non-Apple phone, or turned iMessage off on theirs.

What happens to iMessage when I switch away from an iPhone?

This is the situation that quietly eats messages. If you move your number to an Android phone without turning iMessage off first, Apple's servers still believe your number is on an iPhone, and texts from iPhone users are routed to a device you no longer use.

Turn iMessage off in Messages settings before you hand the old phone over. If the iPhone is already gone, sign in at the company’s official website with your Apple Account and remove the number from your registered devices, or use Apple's deregistration page for a number you no longer have the phone for.

How do I sign in to iMessage on a second device?

1. Sign in to the same Apple Account on the second device in Settings.
2. Open Messages settings and switch iMessage on there too.
3. Open Send and Receive and tick the same addresses you use on your phone, so conversations stay in one thread rather than splitting.
4. On the iPhone, open Messages settings and enable text message forwarding for the second device if you also want ordinary texts to appear on it.

Older conversations do not always appear on a newly added device. Message history syncs only if Messages in iCloud is switched on in your account settings, and even then a large history takes time to download.

What if I cannot sign in at all?

Sign-in failures are Apple Account problems rather than Messages problems. Reset your Apple Account password from a device you are already signed in on, or through Apple's account recovery process. Recovery can take days if you have no trusted device, so start it before you need the messages.

Check also that your account is not locked for security. A locked account fails silently in Messages while working fine elsewhere, and unlocking it is done through the Apple Account settings, not through Messages.