You can find a variety of free ringtones online specifically formatted for iPhones. These files must be in the format to be recognized as ringtones.
remains a classic device, and personalizing it with custom ringtones is still possible. Whether you want to download pre-made tones or create your own from a favorite song, there are several reliable methods to get the job done. 1. Download Pre-Made Ringtones
: Provides a collection of clean, simple, and high-quality ringtones.
Putting a custom ring tone on an iPhone - how? : r/applehelp
Since the iPhone 4 is an older device, the most reliable way to add these files is through a computer using (on Windows or older macOS) or Finder (on newer macOS).
Open a Finder window and select your iPhone under "Locations".