And, when you sign in with the same Apple ID on a new device that also has Messages in iCloud turned on, all your conversations show up there automatically.

Using iMessage without iCloud

Using iMessage without iCloud

FaceTime works in the exact same manner in terms of phone numbers and Apple IDs. While most people use the same Apple ID for all of these services to keep things simple, you are by no means required to do so, as each of these features operated independently of the others.

Add or remove your phone number in Messages or FaceTime

Add or remove your phone number in Messages or FaceTime

In the "You can receive iMessages to and Reply From" section, make sure that your phone number and Apple ID are selected. If you use this feature and share your Apple ID with someone, you can't prevent them from seeing your conversations.

Privacy

Privacy

And if you use the latest versions of watchOS and iOS and turn on two-factor authentication, your health and activity data will be backed up in a way that Apple can’t read. If you later decide to stop sharing, then the other user’s iPhone will delete historical data stored in the Fitness app. Choose which data and trends to share, including heart health, activity, labs, vitals, Medical ID, cycle tracking, and more.

ResearchKit enables developers to create apps that let medical researchers gather robust and meaningful data for studies. With ResearchKit, you choose which studies you want to join, and you control the information you provide to individual research apps. Any apps built using ResearchKit for health-related human subject research must obtain consent from the participants and must provide information about confidentiality rights and the sharing and handling of data.

Once shared, the data is stored securely within Apple in a system designed to meet the technical safeguard requirements of the Health Insurance Portability and Accountability Act (HIPAA).

How to Change Apple ID for iMessage on iPhone & iPad

How to Change Apple ID for iMessage on iPhone & iPad

Do you want to use a different Apple ID or email address for sending and receiving messages over iMessage? By default, iMessage uses the Apple ID that’s linked to your iOS or iPadOS device. Contacts who don’t have your number will be able to send texts to this Apple ID email address. Now, you’ll see the phone number and email address that’s used for sending and receiving texts over iMessage. Now, enter the email address and password details for your alternate Apple ID and tap on “Sign In”. You can set this up in a way that you stop using your phone number for new iMessage conversations and keep your details private.

It’s best to always just use the same Apple ID for all of your own, this allows for reliable syncing, data backups, and easier use of devices.

How to Use iMessage on iPhone and iPad Without a SIM and Phone

How to Use iMessage on iPhone and iPad Without a SIM and Phone

Using iMessage in this manner comes handy to parents who want their children to send and receive messages without a phone number. As mentioned before, iMessage is Apple’s own instant messaging service like WhatsApp. You can send and receive messages between various Apple devices such as iPhone, iPad, and Mac.

You can send messages like images, videos, location, document audio, etc., through iMessage to other Apple users. The iMessage service is present inside the regular Messages app. But the SMS service needs a working phone number and a SIM card to function.

Here are the steps to set up iMessage without a phone number or SIM on your iPhone or iPad. Step 1: Make sure an iCloud account is added on your iPhone or iPad.

In most cases, you must have added an Apple ID when you activated your iPhone or iPad. Pro Tip: If no Apple ID is added to your device, you will be asked to sign in at this stage. Typically, when there is no SIM card on the device, Apple automatically shifts the profile to an email ID.

Even if you see Waiting for activation, you can send and receive messages via your Apple ID. You can send text messages, documents, videos, links, photos, etc., to other Apple users. Now you can use iMessage on any of your iPad or iPhone with the same Apple account without worrying about having a SIM card. Videos will consume more data as compared to simple text messages.

No Apple ID, iMessage/Facetime, iOS restrictions

After some research, I discovered that supposedly you can't use iMessage and FaceTime unless you have an Apple ID. I prevent this by disabling "Allow modifying device settings (Supervised Only)" so that they cannot sign into any accounts.

Your Apple ID and Phone Number Are Being Used on Another

Your Apple ID and Phone Number Are Being Used on Another

This ensures that your ‌iCloud‌ user data, app downloads, and media purchases can sync between them. Even if you haven't done anything recently to warrant the pop-up message and you don't recognize the default name of the device ("‌iPhone‌," for example), it doesn't necessarily mean anything untoward has occurred. Sometimes it takes a while for Apple to update your ‌Apple ID‌ device list in its Activation Servers.

On other occasions, the message will pop up if you turn on a device that hasn't been connected to the internet for a while, especially if you logged in to iMessage or ‌FaceTime‌ during the period that it was disconnected. In these cases, the message is simply a delayed notification and not a sign of a compromised ‌Apple ID‌. If you see anything untoward or suspicious – a device linked to your ‌Apple ID‌ that you don't recognize, for example – then your account may be compromised.

This additional security feature is designed to prevent anyone from accessing your account, even if they know your password.

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