Check your internet connection. The most common reason why FaceTime is unavailable is due to.
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Can I Download Facetime On My Macbook Air
Setting Up Facetime On Macbook

MacBook Air, MacBook Pro, even the iMac, all have that 720p webcam. But, there is one current Mac with a better camera. Chances are you don't have it, so don't get too excited. Even the 2010 MacBook Pro’s 1280-by-1024 iSight camera performed better than the 2020 MacBook Air’s 720p FaceTime HD camera (1280-by-720 resolution) in some circumstances. None of them hold a candle to an iPhone 11’s front-facing TrueDepth camera, which provides a whopping 12 megapixels of resolution and can record 4K video at 60 frames.

Hi,

FaceTime and iChat are two different apps

FaceTime will do Video only and tow one person at a time.

This person can be on an iPhone (4), certain iPod Touches with an Apple ID rather thana phone number or another Mac with Face time on it.

FaceTime comes in Lion.

In Snow Leopard it was downloadable from the App Store.

Can I Download Facetime On My Macbook Air

10:31 PM Wednesday; February 29, 2012

Please, if posting Logs, do not post any Log info after the line 'Binary Images for iChat'

 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
'Limit the Logs to the Bits above Binary Images.'  No, Seriously

Feb 29, 2012 2:31 PM

If you can't sign in to FaceTime

Make sure that you can sign in at appleid.apple.com. Learn what to do if you forgot your Apple ID or forgot your Apple ID password.
Choose Apple () menu > System Preferences, then click Date & Time and select “Set date and time automatically”. Click Time Zone and make sure that the settings are correct.
Make sure that you've installed the latest software updates.

If your camera or microphone doesn’t work

Setting Up Facetime On Macbook

One of these solutions might help:

Quit FaceTime, then open FaceTime again.
Restart your Mac (Apple menu > Restart).
Make sure that FaceTime isn't open, then see if your camera works in another application, such as Photo Booth. If it doesn't, you know that the issue isn't related to FaceTime.
If you have multiple cameras or microphones connected to your Mac, check the Video menu in the FaceTime menu bar to make sure that you have the correct camera and microphone selected.

If you need help with your connection or call quality

A slow or busy Wi-Fi network might cause issues with your FaceTime call. If you experience connection alerts or low-quality audio or video:

Make sure that you and your recipient have a fast Wi-Fi or cellular connection. FaceTime calls over Wi-Fi require a broadband connection.
Check for issues that might be slowing down your connection, such as someone streaming content over your network.
If you have questions about your Internet speed, contact your Internet service provider.

FaceTime is not available in all countries or regions.

Can I Download Facetime On My Macbook Air?