How to resolve error for iMessage and FaceTime on iPhone?

Try resubscribing:

• Open Settings
• Tap Apps
• Tap Messages
• If iMessage is off, turn it on
• Tap Send & Receive
• Scroll down until you see AppleID: and your Apple ID
• Tap your Apple ID
• Tap Sign Out
• Tap Messages at the top left to go back to the main Messages page
• Tap Settings at the top left to go back to Settings/Apps

For FaceTime:

• Verify you are still in Settings/Apps
• Tap FaceTime
• If FaceTime is off, turn it on
• Scroll down until you see AppleID: and your Apple ID
• Tap on your Apple ID
• Tap Sign Out
• Restart your phone→Restart your iPhone - Apple Support

Now reverse the process:

• Open Settings
• Tap Apps
• Tap Messages
• Tap Send & Receive
• Tap Sign In and do so
• Tap Messages at the top left to go back to the main Messages page
• Tap Settings at the top left to go back to Settings/Apps

• For FaceTime:
• Verify you are still in Settings/Apps
• Tap FaceTime
• IScroll down until you see AppleID and Log in

Welcome and thank you for reaching out. 🤗

First, try the following steps:

• Disable any VPN connections and restart your iPhone or tell Siri: "Restart".
• Learn how to update your iPhone to the latest version of iOS.
• Learn what to do if your iPhone won’t update.

Sign in issue:

Learn what to do → If you can’t turn on or sign in to iMessage.

Connection issue:

Learn what to do → If you can't send or receive messages.

Need more help?

• Contact Apple Support if you still can't send or receive iMessages
• Contact your carrier if you still can't send or receive SMS, MMS or RCS messages

Additional help:

• United States: 1-800-APLCARE.
• Contact Apple Support.
• Get Support.

Good Luck! 👋🏼😉

Smiliñ 😎 Brian | Community Volunteer

To activate iMessage and FaceTime using your Phone number

1. First, check to know whether you have an SMS plan enabled for at least one SMS*** with your carrier. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM to you
2. If your iPhone is used with a carrier not found in the wireless carrier articles, make sure you can send and receive international SMS. (One international SMS*** Only)
3. If you can't turn on or sign in to iMessage or FaceTime - Apple ...

*** You may not have an SMS plan (Domestic & International) enabled by your carrier for the SIM/eSIM that you use on your device. Apple Inc. does not provide SMS services.