Why can't oppo mobile phones receive domestic notification information when they arrive in Japan?

Oppo mobile phones cannot receive domestic notification information in Japan for the following reasons:

1. Different network standards: Japan and China adopt different mobile communication network standards. For example, WCDMA and LTE are mainly used in Japan, while TD-SCDMA and FDD-LTE are mainly used in China. Therefore, even if the oppo mobile phone can be used normally in Japan, if it does not support local network standards, it may not be able to receive domestic notification information.

2. SMS center number is set incorrectly: the SMS center number used by oppo mobile phone in China is provided by the operator. If you change or delete the number overseas, you may not be able to receive domestic SMS notifications.

3. Firewall shielding: Some countries will filter or block international short messages to prevent the spread of spam messages. If oppo mobile phone is identified as a spam sender in Japan, it may be intercepted or filtered out of domestic notification information. It is recommended to try the following solutions:

4. Confirm whether the mobile phone supports the local network standard, and replace the SIM card or adjust the network settings as needed.

5. Check whether the number of SMS center is correct, and try to add the correct number manually.

6. If the above methods are ineffective, you can contact the local operator or oppo customer service for help.