The differences between Android China ROM and Global ROM are:
1. **Pre-installed apps**: China ROM has China-specific apps pre-installed, while Global ROM has no China-specific apps and instead includes Google services like Play Store and Google apps as defaults.
2. **Language support**: Global ROM has better language support with English as the default language and more languages available overall. China ROM defaults to Chinese but can be changed to English, though some UI elements may still display in Chinese.
3. **Google services**: Global ROM has Google services pre-installed, including Play Store, Gmail, Chrome, etc. China ROM does not include Google services by default, but they can be installed later.
4. **Update speed**: China ROM generally receives faster updates since it doesn't require Google approval. Global ROM updates are slower due to Google's restrictions.
5. **Cellular bands**: China ROM phones may have some cellular bands optimized for China that could cause issues in other countries. However, this is not always the case and depends on the specific phone model.
6. **Warranty**: Buying a China ROM phone outside of China usually means no warranty coverage.
7. **Unlocking bootloader**: For China ROM phones, unlocking the bootloader to install a Global ROM is usually possible. For Global ROM phones, installing a China ROM may not be allowed.
