Hey wafa2,

If the Messages app was working on your MacBook before upgrading to Yosemite first check to see if the Continuity feature is set up correctly:

Get help using Continuity with iOS 8 and OS X Yosemite - Apple Support
http://support.apple.com/en-gb/TS5458

Get help using Continuity with iOS 8 and OS X Yosemite

Occasionally when you use Continuity with your iPhone, iPad, iPod touch, or Mac, you might find that a phone call doesn't transfer to your other devices. You might not see the Handoff app icons where they should be. Or Instant Hotspot might not share the Internet with your other devices. Learn how to fix these issues.

 

 

If a Continuity feature like Handoff, phone calls, Instant Hotspot, or SMS messages isn't working the way you'd expect, make sure your devices meet the requirements. Then check your settings.

Check System Requirements

Make sure your iPhone, iPad, iPod touch, or Mac meet the system requirements for Continuity, and for the specific features you want to use.

Check your settings

Check the following settings on your iPhone, iPad, or iPod touch:

• Go to Settings > Wi-Fi and turn on Wi-Fi if necessary.
• Make sure your iOS devices are connected to the same Wi-Fi network by going to Settings > Wi-Fi and comparing the name of the network each is on.
• Go to Settings > Bluetooth and turn on Bluetooth if necessary.
• Go to Settings > General > Handoff & Suggested Apps and make sure Handoff is on.
• Go to Settings > Phone. If you see Wi-Fi Calling, turn it off.

Check the following settings on your Mac:

• Go to the Wi-Fi icon at the top of your screen and turn on Wi-Fi if necessary.
• Make sure your Mac and iOS devices are connected to the same Wi-Fi network. Go to Settings > Wi-Fi on your iOS device and compare the name of the network with the Wi-Fi network on your Mac.
• Go to the Bluetooth icon at the top of your screen and turn on Bluetooth if necessary.
• In System Preferences > General, select “Allow Handoff between this Mac and your iCloud devices.” If you don't see this setting, your Mac may not support Handoff.
• Open the FaceTime app, go to FaceTime > Preferences and turn on “iPhone Cellular Calls.”
• Go to System Preferences, and sign out and then sign in again to your iCloud account.

If confirming the Continuity settings doesn't resolve the issue, try this on your MacBook Pro:  1) sign out of your Messages account 2) restart the computer 3) sign in again.  Also, check the settings outlined in this article:

iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage - Apple Support
http://support.apple.com/en-us/HT201349

iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage

Learn how to link your iPhone telephone number to your Apple ID for use with FaceTime and iMessage.

 

Your iPhone telephone number is linked to your Apple ID when you sign in to FaceTime or iMessage. This allows you to use your iPhone number with FaceTime and iMessage on other iOS devices.

• This feature isn't available on iPod touch (3rd generation) and iPad (1st generation).
• This feature is available with OS X Mountain Lion v10.8.2 or later.

You can sign in to your Apple ID on an iPhone by tapping Settings > FaceTime and Settings > Messages > Send & Receive.

On iOS devices, find out which addresses are enabled with FaceTime and iMessage by tapping:

• Settings > Messages > Send & Receive > You can be reached by iMessage at:
• Settings > FaceTime > You can be reached by FaceTime at:

On OS X, find out which addresses are enabled:

• In Messages, choose Messages > Preferences > Accounts. Select iMessage in the left column. Your contact preferences should appear under "You can be reached for messages at:."
• In FaceTime, choose FaceTime > Preferences. Your contact preferences should appear under "You can be reached for calls at:."

Use iMessage and FaceTime with multiple devices

Learn how to set up iMessage on multiple devices. The same steps apply when you set up FaceTime.

1. Sign in to an Apple ID on your iPhone. You will see all addresses verified with the account.
2. Tap an address to enable it on the device. The telephone number will be dimmed when you view these settings on an iPhone.
3. If you don't want to use iMessage with your iPhone telephone number, tap Settings > Messages and turn iMessage off.

   

4. You can sign in to the same Apple ID on another device. These images show the iMessage settings on an iPad and OS X using the same Apple ID.

   iPad:

   

   OS X:

   

   After signing in to the Apple ID on another device, the iPhone will receive a notification. The notifications below explain that you used the Apple ID and phone number with iMessage on a MacBook Pro. You will receive a notification for every address or phone number you enable on each additional device.

    

Learn more

Unlink a phone number

To remove a phone number from an Apple ID, sign out of FaceTime and Messages on your iPhone:

• Settings > Messages > Send & Receive. Tap your Apple ID, then tap Sign Out.
• Settings > FaceTime. Tap your Apple ID, then tap Sign Out.

This should remove your phone number from other devices using the same Apple ID with FaceTime and Messages. If the phone number is still available on other devices after you sign out of FaceTime and iMessage on the iPhone, you may need to sign out of iMessage and FaceTime on all your devices, then sign in to FaceTime and Messages again on devices you want to use.

Note: If you no longer have access to the iPhone that is using the number you want to remove, reset your Apple ID password.

Phone number missing on iPad or iPod touch

If your phone number isn't listed on an iPod touch or iPad, follow these steps:

1. Update to the latest version of iOS.
2. Verify that you're using the same Apple ID that you're using on your iPhone.
3. On your iPad or iPod touch, sign out of your Apple ID in the following locations:
   • Settings > Messages > Send & Receive. Tap your Apple ID, then tap Sign Out.
   • Settings > FaceTime. Tap your Apple ID, then tap Sign Out.
4. Sign in to your Apple ID with FaceTime and iMessage.

If your phone number still isn't listed, follow these steps:

1. Sign out of your Apple ID on all iOS devices, including your iPhone, in the following locations:
   • Settings > Messages > Send & Receive. Tap your Apple ID, then tap Sign Out.
   • Settings > FaceTime. Tap your Apple ID, then tap Sign Out.
2. Sign in to your Apple ID on your iPhone.
3. When activation is complete, your Apple ID and all verified email addresses should be visible in Settings > Messages > Receive At and Settings > FaceTime.
4. Sign in to your Apple ID on your other iOS devices.

Phone number missing on OS X

If your phone number isn't listed on your Mac, follow these steps:

1. Update to the latest version of OS X on your Mac.
2. Verify that you're using the same Apple ID that you're using on your iPhone.
3. Sign out of your Apple ID at these locations on your Mac:
   • Messages > Preferences > Accounts tab. Click iMessage in the left column, then click Sign Out.
   • FaceTime > Preferences. Select your Apple ID, then click Sign Out.
4. Close FaceTime and Messages on your Mac.
5. Open FaceTime and Messages, then sign in to your Apple ID in Preferences.

If your phone number still isn't listed on your Mac, follow these steps:

1. Sign out of your Apple ID on all iOS devices, including your iPhone, in the following locations:
   • Settings > Messages > Send & Receive. Tap your Apple ID, then tap Sign Out.
   • Settings > FaceTime. Tap your Apple ID, then tap Sign Out.
2. Sign out of your Apple ID on your Mac at the following locations:
   • Messages > Preferences > Accounts tab. Click iMessage in the left column, then click Sign Out.
   • FaceTime > Preferences. Select your Apple ID, then click Sign Out.
3. Close FaceTime and Messages on your Mac.
4. Sign in to your Apple ID on your iPhone.
5. When activation is complete, your Apple ID and all verified email addresses should be visible in Settings > Messages > Send & Receive and also in Settings > FaceTime.
6. Open FaceTime and iMessage, then sign in to your Apple ID in Preferences.

 

Last Modified: Dec 16, 2014

Have a great day!

- Judy