There’s also one method which you can use to get unlimited Google Photos storage on your phone.
1. You can install Pixel Experience ROM on your mobile.
Note: Find ROM for your smartphone by visiting the link. (https://download.pixelexperience.org/devices)
2. This custom ROM makes your smartphone close to a pixel-like experience with all the stock Android features.
3. Then, when you sign into the Google Photos app, it’ll recognize your device as a Pixel mobile phone.
4. Hence, you might be able to use unlimited Google Photos storage for free.
However, Pixel Experience ROM is not available for all the smartphone. Moreover, you should have some technical knowledge to install custom ROM. So, keep this in mind. Also, if Google Photos recognize that you’re not using a pixel smartphone, then you’ll no longer get unlimited storage, but it’s an interesting way you can try out.