The easiest way to replace the default ringtone on your iPhone or Android phone is to download a custom audio file from a https://tonosdellamadamp3.com/. For iPhones, you can browse and download the ringtone you want through iTunes. For Android phones, you can search for and download the ringtone using an app like Zedge.

Some of these websites offer a free ringtone download, but others will charge you a small fee to download the file. You can avoid these charges by downloading from reputable sites and only downloading files that are under 40 seconds in length.