Can I send messages to different contacts that are not mine?

Hello sregnier,

That's a wonderful question and you've come to a fantastic place for help! If you're signed in to the same Apple ID for iMessage on all three iPhones, you can send and receive iMessages on all three devices. If you're not wanting messages to appear across all three devices, you would want to use a separate Apple ID for each device. If these are devices that belong to different family members, it is recommended that each family member use a separate Apple ID. You can find the steps for creating a new Apple ID for your family members via the following link. The section titled "Create an Apple ID on your iPhone, iPad, or iPod touch" walks through creating a new Apple ID directly from an iOS or iPadOS device.

How to create a new Apple ID

You may also benefit from Family Sharing. This will allow features such as iMessage, FaceTime, and other Apple ID related features to be separate from yours, but you'd be able to manage the ability to share purchases with your family along with subscriptions. More information about Family Sharing can be found via the following link.

Set up Family Sharing

If you're wanting to continue using the same Apple ID on all three devices or the iPhones are your personal devices, you can use the same Apple ID for iMessage. This would allow for incoming and outgoing iMessages to appear on each iPhone and give you the opportunity to respond via the desired iPhone. You can choose which phone number you would like to use with iMessage by following the steps in the "Set up your phone number" section the article below.

Add or remove your phone number in Messages or FaceTime

You may also find using iCloud for Messages and/or text message forwarding helpful. More information about both of those features is detailed in the links below.

Use Messages in iCloud

How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch or Mac

We hope you have a great rest of your week!