To resolve the issue of your adidas headphones not working with your Nubia Neo 2 phone, follow these step-by-step instructions:

1. Check Bluetooth Compatibility:
Ensure your adidas headphones are compatible with your device's Bluetooth version. Sometimes, older headphone models may have compatibility issues with newer phones.

2. Make Headphones Discoverable:
- Turn on your adidas headphones.
- Press and hold the Bluetooth button for about 10 seconds until the LED light flashes three times. This indicates that the headphones are in pairing mode - learn more.

3. Reset the Headphones (if the issue persists):
- Place your adidas headphones in their case (if applicable) and ensure they are turned off.
- Press and hold the Bluetooth button while placing the headphones back in the case.
- Hold for another 10 seconds until the lights flash in a specific pattern indicating a reset.

4. Reboot Your Phone:
Restart your Nubia Neo 2. This can help refresh the system and clear any minor software issues that may be affecting Bluetooth connectivity.

5. Forget and Re-pair:
- Go to the Settings on your Nubia Neo 2.
- Select Connected devices or Bluetooth settings.
- If your adidas headphones are listed, select them and choose Forget or Unpair.
- After this, attempt to pair the headphones again by following the previous steps.

6. Check for Software Updates:
Ensure that your Nubia Neo 2 has the latest software updates installed. Navigate to Settings > System > Software Update to check for any available updates.

7. Clear Bluetooth Cache (if applicable):
If your device allows it, you can clear the Bluetooth cache to solve potential conflicts. Navigate to Settings > Apps > Show System Apps > Bluetooth and select the option to clear the cache.

8. Consult Device Forums:
If none of the above steps resolve the issue, consider visiting relevant forums such as Reddit, where users discuss their experiences with similar devices - learn more.

9. Contact Support:
If the problem still occurs, reach out to adidas customer support or visit their support site for specific troubleshooting regarding the headphones - learn more.

By following these steps, you should be able to successfully connect your adidas headphones to your Nubia Neo 2 phone.