It is technically possible to use your phone's NFC (Near Field Communication) to mimic the functionality of an amiibo, but this would require some additional steps.
To use your phone as an amiibo, you would need to download and install a third-party app that can emulate an amiibo's functionality. One popular app that can do this is called TagMo.
Once you have installed the app, you would need to acquire the data for the specific amiibo you want to emulate. This data can be obtained by scanning an actual amiibo with an NFC-enabled device, or by downloading it from a reputable online source.
Once you have the amiibo data, you would need to load it into the TagMo app and write it to a blank NFC tag. This tag can then be used in place of an actual amiibo with compatible games and devices.
It is worth noting that using a phone as an amiibo may not be officially supported by all games and devices, and there is a risk that using unofficial emulation methods could potentially damage your device or cause other issues. As always, it is important to exercise caution and do your research before attempting to use your phone as an amiibo.