One day I tried to reset my iPhone¬†using the “Erase All Content and Settings“, then the¬†nightmare started!

I was taken to the activation screens, and begun with the setup wizard until I chose a Wi-Fi network the process started, and gave me a message that it will take about three minutes to activate iPhone, few minutes later a screen with this message appears: “Your iPhone could not be activated because the activation server is temporarily unavailable.”

After couples of try and fail, I found the below solution and resolved the problem.

  1. Open iTunes.
  2. Connect the iPhone
  3. Press both the home and sleep/wake buttons until the Apple icon appears (ignore the red slider if it shows).
  4. Continue pressing the home button alone until iTunes sees your phone in recovery mode.
  5. Follow the prompts to restore the iPhone.

You may be able to recover your data from your last backup, or you can also choose to configure iPhone as a new cell phone.