Blocking or unblocking a phone number on Android is a straightforward process, but the exact steps might vary slightly depending on your phone model and Android version. Here’s a general guide:

To block a phone number:

1. Open the Phone app: This is the default app for making and receiving calls on your Android device.
2. Navigate to the call history: Look for the tab or section that shows your recent calls.
3. Find the contact or number you want to block: Scroll through your call history until you find the phone number you want to block.
4. Tap on the contact or number: This will open a details screen for the contact or number.
5. Tap on the three dots menu: This is usually located in the top right corner of the screen.
6. Select “Block number”: This option might be worded slightly differently depending on your device, but it should be clear that it blocks the selected number.
7. Confirm your choice: You might be asked to confirm that you want to block the number. Tap “Block” or “OK” to proceed.

To unblock a phone number:

1. Open the Phone app: Follow the same steps as above to access your call history.
2. Tap on the three dots menu in the top right corner.
3. Select “Settings”: This will open the phone app’s settings menu.
4. Tap on “Blocked numbers”: This option might be located differently depending on your device, but it should be under the “Calls” or “Blocking” section.
5. Find the phone number you want to unblock: Scroll through the list of blocked numbers until you find the one you want to unblock.
6. Tap on the “X” next to the number: This will remove the number from the blocked list.
7. Tap “Unblock” or “OK” to confirm: You might be asked to confirm that you want to unblock the number.

Additional tips:

• You can also block or unblock numbers directly from your contacts list.
• Some third-party call blocking apps offer more advanced features, like call filtering and scheduling.
• If you’re having trouble blocking or unblocking a number, consult your device’s user manual or contact your carrier for support.