1. Check if the IP is valid and stable, and ensure the IP information is correct.

2. Verify if the cloud phone's IP needs to be added to the proxy provider's whitelist.

3. Determine if the IP supports direct connection or if it can only be used in an overseas environment. It is recommended to use an IP that supports direct connection.

4. Check if the IP restricts access to certain websites or Apps.

5. Contact the IP provider's customer service for inquiry.