To make any Android phone vibrate when a call is answered, follow these steps based on your phone's manufacturer:

Samsung Galaxy:

  1. Open the Phone app.
  2. Tap the three-dotted icon (kebab menu) in the top right corner.
  3. Select Settings.
  4. Go to Call alerts and ringtone settings.
  5. Enable the "Vibration when answered" option.

OnePlus, Oppo, Realme:

  1. Launch the Phone app.
  2. Tap the three-dotted icon.
  3. Select Settings.
  4. Navigate to Calling accounts > Answer/End calls.
  5. Turn on "Vibrate when other party answers/ends a call" option.

Redmi and POCO:

  1. Open the Phone app.
  2. Tap the hexagonal icon in the top right corner.
  3. Go to Advanced settings.
  4. Tap "Vibrate when your call is answered" and select the Normal option.

Vivo and iQOO:

  1. Launch the Phone app.
  2. Tap the three-dotted icon.
  3. Select Call settings.
  4. Enable the "Vibrate when the other party answers/hangs up" option.

Motorola:

  1. Head to Android Settings > Sound & vibration > Vibration and haptics.
  2. Turn on the toggle next to "Outgoing call vibration."

Infinix:

  1. Launch the Phone app.
  2. Tap the hexagonal icon in the top right corner.
  3. Go to Advanced Settings.
  4. Enable the "Vibrate on Answered/Ended Call" toggle.

Nothing Phone:

  1. Open the Phone app.
  2. Tap the three-dotted icon.
  3. Select Settings.
  4. Go to Calling accounts.
  5. Turn on the "Vibrate for outgoing call accepted" feature.

If your phone lacks this option, you can consider using a third-party app like Nevolution, which is mentioned in a Reddit post. However, the availability and compatibility of such apps may vary.

Please note that the steps provided are based on the information available as of the current date, May 27, 2024. If you encounter any issues or your phone's interface has changed, you may need to adjust these steps accordingly.