The IP address displayed on whatismyip.com is different from the one set in my mobile phone's settings.

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There can be a few different reasons why this is the case:

1. Your mobile network may be using a proxy server or NAT (Network Address Translation) which can cause your IP address to appear differently on external websites.

2. There may be a VPN (Virtual Private Network) or a proxy server set up on your mobile device that is masking your IP address.

3. It is possible that the IP address on your mobile phone hasn't been updated or refreshed in a while and may need to be reset.

Regardless of the reason, it is important to note that IP addresses can change frequently, especially if you are using a mobile device that is connecting to different networks or switching between Wi-Fi and cellular data. Therefore, it is best to rely on whatismyip.com or other similar services to get an accurate and up-to-date reading of your current IP address.