Bank of China, it's best to bring the invoice or receipt issued at the time of purchase, as well as the packaging of mobile phones and the like.
Maintenance process:
1. Log in to Apple official website and click "Technical Support" in the upper right corner.
2. Click "Contact apple Support" in the upper right corner of the technical support page.
3. In the support interface, click Planned Maintenance under Get Maintenance.
4. Select the product type you want to provide.
5. Complete regular maintenance according to the prompt steps.
6. Go to the store for maintenance according to the agreed time.