How to fix iMessage activation error in 2025?

Try these steps:
  1. Make sure your iPhone has a SIM and a stable internet connection (Wi-Fi or mobile).
  2. Check that your date & time is set to auto.
  3. Turn iMessage off and on again from Settings > Messages.
  4. Sign out of your Apple ID and sign back in (Settings > your name > Sign Out).
  5. Restart your phone after doing that.
If it still doesn’t work, wait a few hours — sometimes Apple’s servers are just slow to activate iMessage.
 
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