The FaceTime call must be initiated by an Apple user first. 

Here are the minimum requirements for the supported devices:

• iPhone: iOS 15 or later

• iPad: iPadOS 15 or later

• Mac: MacOS 12 Monterey or later

As the sender/host:Go to the FaceTime app on your iPhone, iPad, or Mac and select the "Create Link" option in the top left corner. You'll then be given a unique link to distribute to a contact -- no matter their device brand. You can also attach a name to the link for a more formal or personal touch. People who join the call using the FaceTime link from an Android or Windows device won't have to log in to join a FaceTime call.

As the receiver: Once the Apple user has sent you a FaceTime invitation, click the link from your messages app, and your internet browser will open a new window. Then, allow your browser access to your camera and microphone if you haven't already. Once the link has loaded, you'll be prompted to enter your name before joining FaceTime calls. Tap "Continue" when you're set. 

As the sender/host:After you send out the FaceTime link, Apple will automatically send a message to the receiver, prompting the user to join your FaceTime call. Once your guest clicks on the invitation, you'll be prompted to accept or decline their entry request by clicking a checkmark or an X, similar to hosting a Zoom meeting. Ensure that you frequently check the app on your Apple device so you don't leave your guest hanging.

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As the receiver:Android users, it's your turn. All that's required for you to join a FaceTime is the call link and a stable Wi-Fi or internet connection. To join, click the FaceTime link and then the green Join button. If all goes well, your face will appear in a small box in the bottom right corner of the screen of your Android phone. If the host of the call hasn't joined yet, the surrounding screen will remain black, with a "Waiting for others to join" notification at the top. 

As the sender/host:From here, you're free to use FaceTime on your iPhone as you normally would. You can add a Memoji sticker or filter, take screenshots within the app, and chat as you please. However, the functionality is more limited for Android and PC users. When you're done with the call, hang up like usual. 

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As the receiver:In classic Apple fashion, you won't be able to use the full FaceTime experience from an Android device. Unlike Apple users, you can't apply a Memoji sticker or filter to give your call a little more color and pop. You also can't capture images using the FaceTime screenshot button like on an iPhone. You can, however, screenshot manually. And unlike on an Apple device, the other user won't be notified that you snapped a photo. Use that information wisely.