iPhone and iPad Messages: iMessage Setup and Carrier Text Problems

To turn on iMessage, open the Settings app on your iPhone, tap Apps, tap Messages, and turn on the iMessage switch. On iOS 17 or earlier, go to Settings > Messages instead.

iMessage is Apple’s own messaging service. It sends texts, photos, and videos over Wi-Fi or cellular data to other people who use iMessage, and those messages show up in blue bubbles. Texts to people who don’t use iMessage go out through your carrier as SMS, MMS, or RCS and show up in green. The steps below follow Apple’s Messages setup guide.

What You Need Before You Start

iMessage has to activate with Apple before it works, so a few things need to be in place first. Apple lists these in its activation help article.

• An internet connection. Connect to Wi-Fi or make sure cellular data is on.
• The latest version of iOS. Check under Settings > General > Software Update.
• The correct time zone. Check under Settings > General > Date & Time.
• SMS messaging on your plan. Your iPhone sends an SMS in the background to activate your phone number with iMessage. Depending on your carrier, you might be charged for that text.
• An active SIM or eSIM. Apple says you need one tied to the phone number you want to use. Without it, you can still use iMessage with an email address.

The Settings path in this guide matches iOS 18 and later, where app settings sit inside an Apps menu. On iOS 17 and earlier, Messages is in the main Settings list.

How to Turn On iMessage on iPhone

Before you tap the switch, know that you might see a prompt that says your network provider may charge for SMS messages used to activate iMessage and FaceTime. If you are fine with a possible charge, tap Turn On when it appears. If you are not sure what your plan charges for a text, check with your carrier first.

1. Open the Settings app. It is the gray gear icon on your Home Screen.
2. Scroll to the bottom and tap Apps. On iOS 17 or earlier, skip this step.
3. Tap Messages. The apps are listed alphabetically, and there is a search field at the top if you would rather type the name.
4. Turn on the iMessage switch. It turns green when it is on.
5. Wait for it to activate. Apple notes that you might need to wait a moment. You may see “Waiting for activation” while your iPhone checks your number.

If you see Use your Apple Account for iMessage on the Send & Receive screen, tap it and sign in. An Apple Account is the account you use for iCloud and the App Store. It used to be called an Apple ID.

How to Check That iMessage Is Working

There are two quick ways to confirm it.

• Check your number. Go to Settings > Apps > Messages > Send & Receive. Your phone number should have a check mark next to it. A spinning gear next to the number means your iPhone is still verifying it.
• Send a message. Open the Messages app and start a text to someone who uses iMessage. Apple says that if a message can be sent using iMessage, you see a blue Send arrow, and the message appears in a blue bubble.

A green bubble does not always mean something is wrong. It usually means the other person is not using iMessage, for example because they have an Android phone. Our guide to the difference between green and blue texts on iPhone covers that in more detail.

Choose the Phone Number and Email iMessage Uses

You can receive iMessages at your phone number, at an email address on your Apple Account, or both.

1. Go to Settings > Apps > Messages.
2. Tap Send & Receive.
3. Under “You can receive iMessages to and reply from,” tap the phone numbers and email addresses you want to use. A check mark shows which ones are active.

Apple warns that when you use both a phone number and an email address, you might end up with separate conversation threads with the same person. To avoid that, pick one of them, usually your phone number, as the main way you start and receive messages.

You can also choose the name and photo people see when you message them; see name and photo sharing in iPhone Messages.

Sync iMessages to Your Other Apple Devices

Turn on Messages in iCloud to keep your conversations the same on your iPhone, iPad, and Mac. Sign in to the same Apple Account on each device.

Read this first: after you turn on Messages in iCloud, any message or attachment you delete on your iPhone is also deleted from your other Apple devices that use the feature. It also uses your iCloud storage.

1. Open Settings and tap your name at the top.
2. Tap iCloud, then tap Messages. If you don’t see it, tap See All in the Saved to iCloud section.
3. Turn on Use on this iPhone.

Messages in iCloud covers your whole message history, including green-bubble texts. If you only want your carrier texts to show up on an iPad or Mac without using iCloud, you can turn on text message forwarding on iPhone instead.

Turn On iMessage on an iPad or Mac

Each device has its own switch. On an iPad, go to Settings > Apps > Messages and make sure iMessage is on, then tap Send & Receive. On a Mac, open the Messages app, sign in with your Apple Account if asked, then choose Messages > Settings and click iMessage. To use your iPhone’s number on those devices, select it along with your Apple Account. Apple explains the full process in Add or remove your phone number in Messages or FaceTime.

Enable iMessage on an Older iPad

On an older iPad such as iPad 2, the older Settings route is Settings > Messages > iMessage, without an Apps submenu. Turn the switch on and use the offered Apple ID sign-in prompt; in Send & Receive, check the email address selected for iMessage. Open Messages and send a test to another iMessage user, then check the blue message and delivery result. This is an older-device menu route, not a promise that every current feature or service will work on obsolete software. An iPad does not gain standalone carrier SMS by enabling iMessage. Apple’s current iPad setup guide uses Settings > Apps > Messages and separates iMessage from messages forwarded by an iPhone. If sign-in or activation fails, consult Apple’s account/service guidance rather than erasing the device or assuming it supports current iPadOS.

What If iMessage Won’t Turn On?

When activation fails, you might see one of these messages: “Waiting for activation,” “Activation unsuccessful,” “An error occurred during activation,” “Could not sign in, please check your network connection,” or “Unable to contact the iMessage server. Try again.” Apple’s fixes are the same for all of them.

• Go back through the requirements. Confirm you are on Wi-Fi or cellular data, that iOS is up to date, and that your time zone is right under Settings > General > Date & Time.
• Allow the activation text. If the prompt about SMS charges appears, tap Turn On. Activation cannot finish for your phone number without that SMS.
• Turn iMessage and FaceTime off, restart, and turn them on. Go to Settings > Apps > Messages and turn off iMessage. Go to Settings > Apps > FaceTime and turn off FaceTime. Restart your iPhone, then turn both back on.
• Give it time. Apple says it might take up to 24 hours for your carrier to verify your phone number. If a spinning gear appears next to your number, your iPhone is already trying, and there is no need to keep turning iMessage off and on.
• Ask your carrier about international SMS. Apple suggests contacting your carrier to make sure you can send and receive international SMS messages.
• Use an email address for now. In Send & Receive, choose an email address from your Apple Account. iMessage can work with that address while your number is still being verified.

The full list, including an online activation request for accounts that still won’t sign in, is in Apple’s article If you can’t turn on or sign in to iMessage or FaceTime on your iPhone.

You Added an eSIM After Setting Up a New iPhone

Apple notes one special case on iOS 26. If you skipped activating iMessage or your eSIM during setup and added the eSIM later in Settings, iMessage does not activate on its own. An eSIM is a digital SIM built into the phone. Your texts might show a Not Delivered alert, go out green, or come from your email address instead of your number. The fix is to go to Settings > Apps > Messages and turn iMessage off and back on.

The iMessage Switch Is Missing or You Can’t Find Messages

Look in the right place for your iOS version. On iOS 18 and later, Messages is inside Apps at the bottom of Settings. On older versions it is in the main list. You can also pull down on the Settings screen and type Messages in the search field.

If you see a “MMS messaging needs to be enabled” alert instead, that is a different setting; here’s how to fix it.

How to Turn iMessage Off Again

Go to Settings > Apps > Messages and turn off the iMessage switch. Apple says you might still be able to send and receive SMS, MMS, or RCS messages with iMessage off, as long as your iPhone has a cellular plan. Those messages are green.

If you are moving to a non-Apple phone, turn off iMessage and FaceTime on the iPhone before you move your SIM. Otherwise texts from iPhone users may keep going to iMessage instead of your new phone. If you no longer have the iPhone, Apple has an online option described in Deregister iMessage on your iPhone or online.

Sign Out of iMessage on an iPad

On an iPad, open Settings > Apps > Messages > Send & Receive. On iPadOS 17 and earlier, open Settings > Messages > Send & Receive directly. Tap the Apple Account address (called Apple ID on older software), then choose Sign Out. Apple’s Messages account instructions include this sign-out route for iPad and iPhone. Revisit the screen to check that the account is signed out.

This signs out of the account used for iMessage on that device; it does not sign the iPad out of every Apple service or erase existing conversations. To stop iMessage on the iPad altogether, turn its iMessage switch off in Messages settings. FaceTime and other iCloud features have separate controls. To use iMessage again, turn the switch on and use the offered Apple Account sign-in option. If you are giving away the iPad, signing out of Messages alone is not a complete device-transfer procedure.

Send an iMessage and Understand Its Privacy Limits

After activation, open Messages, tap Compose, enter and check the recipient’s phone number or iMessage address, type the message and check for a blue Send arrow before sending. Tap that arrow and inspect the delivery result. Apple’s message-type guide describes iMessage’s end-to-end encryption and blue bubbles. SMS/MMS are not end-to-end encrypted. Green RCS conversations have their own encryption requirements and indicator, so color alone does not establish that every green message has identical protection.

Encryption during transmission does not keep a conversation secret from someone who can open either device, see a notification preview, access a linked device or receive a screenshot from the recipient. Check your intended recipient and your own device and notification access before sharing private material. A blue bubble does not prevent the recipient from saving or forwarding the contents. Messages in iCloud and backups have separate settings; do not assume a private-send switch disables all copies. If iMessage fails, inspect the offered resend method before choosing an SMS fallback.

Turn Off iMessage on an iPad or Silence Its Alerts

On the iPad, open Settings > Apps > Messages and turn iMessage off; on iPadOS 17 and earlier, open Settings > Messages directly. Reopen that page and check that the switch is off. Turning it back on restores the service, subject to sign-in and activation. The account sign-out steps above are separate, and turning off iMessage does not erase stored conversations or turn off FaceTime. As Apple’s Messages setup guide explains, carrier SMS, MMS and RCS on iPad are forwarded from an iPhone; an iPad cellular data plan alone does not provide standalone carrier texting. If you only want fewer alerts while keeping messages available, use Settings > Notifications > Messages > Allow Notifications off instead. Open Messages to read received texts and turn Allow Notifications back on to restore alerts; Apple documents this notification alternative.

Fix a Carrier “Message Blocking Active” Error

A Message Blocking Active response concerns carrier text service or blocking; turning iMessage on is not a universal fix. Note whether the failure is a carrier text or an iMessage, whether it affects one recipient or everyone, and verify the recipient’s number. For T-Mobile, its messaging troubleshooting guide says to check Message Blocking and Family Allowances on both ends; for an error to one person, that person’s message blocking may be active. Also check service signal and the account’s ability to send messages. A blue iMessage needs the separate Apple/iMessage troubleshooting above. Do not assume a single iPhone switch controls the carrier account.

T-Mobile’s Message Blocking instructions say the Primary Account Holder can manage it on T-Mobile.com or in T-Life. Follow the Blocking-page link in that official guide, review the setting for the correct line and change it only if you are authorized and intend to allow those texts. Other carriers use their own account controls. Retry a normal text with the intended recipient after the authorized change. If you cannot access the setting or the error continues, ask your carrier to check the line’s messaging restrictions; a recipient-side block requires that recipient’s decision. For an intentionally blocked contact, see our iPhone blocking guide. There is no need to disable unrelated account protections or reset the entire phone to inspect a carrier block.

Frequently Asked Questions

How do I turn on iMessage?

Go to Settings > Apps > Messages and turn on iMessage. On iOS 17 and earlier, go to Settings > Messages.

Does iMessage cost money?

Apple does not charge for iMessage. Messages travel over Wi-Fi or cellular data, and Apple notes that cellular data rates might apply when Wi-Fi is unavailable. Your carrier might also charge for the single SMS used to activate your number.

Can I use iMessage with Android phones?

No. iMessage only works between Apple devices. Messages to Android phones are sent as SMS, MMS, or RCS and appear in green bubbles.

Are iMessages private?

Apple says iMessage conversations are encrypted end-to-end, which means they can’t be read while they are sent between devices. SMS and MMS messages are not end-to-end encrypted.

Why are my messages still green after I turned on iMessage?

The person you are texting may not use iMessage, or your number may still be activating. Check Send & Receive for a check mark next to your number, and remember that activation can take up to 24 hours.

Can I use iMessage without a phone number?

Yes. You can use an email address from your Apple Account. Choose it under Send & Receive in the Messages settings.

Do I need to turn on FaceTime too?

No, they are separate switches, although they activate the same way. If you want to video call, see how to use FaceTime on iPhone. You can also turn read receipts on or off on iPhone if you want to control when people see that you’ve read their messages.

What to Do Next

Once your bubbles are blue, iMessage is ready. GIFs animate most reliably over iMessage, so try sending GIFs on iPhone. New to texting on iPhone? See the complete guide to text messaging on iPhone.