If I put my SIM card into someone's old device still logged into their apple ID, will their current devices receive my text messages?

Thanks for posting in the Apple Support Communities xoe-321,

It's recommended that each user have their own unique Apple ID, to ensure your personal data remains private, and available only to you and those you intentionally share it with.

The previous owner of the device should complete the following steps to get the device ready for a new owner:

Transfer information to your new device

If you have a new iPhone or iPad, you can use Quick Start to automatically transfer information from your old device to your new device if you're using iOS 11 or later. Use iCloud, iTunes, or the Finder to transfer information to your new device if you're using iOS 10 or earlier. 

If your phone number will change with your new device, add additional trusted phone numbers to your account to ensure you don't lose access. If you no longer have access to your old phone number, you can generate a two-factor authentication code on your old device if needed. 

If applicable, remove your personal information from your old device

1: If you paired an Apple Watch with your iPhone, unpair your Apple Watch.

2: Back up your device.

3: If you purchased an AppleCare plan for your device, cancel your AppleCare plan.

4: Sign out of iCloud and the iTunes & App Store. 

• If you're using iOS 10.3 or later, tap Settings > [your name]. Scroll down and tap Sign Out. Enter your Apple ID password and tap Turn Off.

• If you're using iOS 10.2 or earlier, tap Settings > iCloud > Sign Out. Tap Sign Out again, then tap Delete from My [device] and enter your Apple ID password. Then go to Settings > iTunes & App Store > Apple ID > Sign Out.

5: If you're switching to a non-Apple phone, deregister iMessage.

6: If in-store trade-in is available in your country or region and you're trading in at an Apple Store, stop here, do not erase your device, and visit your nearest Apple Store to pick up your new device. After a Specialist completes your trade-in, they'll work through the remaining steps with you in-store. If you're completing your trade-in online, continue to step 7.

7: Go back to Settings and tap General > Transfer or Reset [device] > Erase All Content and Settings. If you turned on Find My [device], you might need to enter your Apple ID and password. If your device uses eSIM, choose the option to erase your device and the eSIM profile when asked.

8: If asked for your device passcode or Restrictions passcode, enter it. Then tap Erase [device].

9: Contact your carrier for help transferring service to a new owner. If you aren't using a SIM card with your device, you can contact them to get help transferring service to the new owner.

10: Remove your old device from your list of trusted devices.

What to do before you sell, give away, or trade in your iPhone or iPad

We hope this helps!