To change the ringtone on an iPhone, follow these simple steps:

1. Open the Settings app on your iPhone.
2. Scroll down and tap "Sounds & Haptics" (or "Sounds" on older models).
3. Tap "Ringtone."
4. Browse the list of available ringtones. Tap any ringtone to hear a preview and select it as your new default ringtone.

This will immediately set your new ringtone for all incoming calls. If you want to use a custom ringtone, you can either buy one from the iTunes Store or create/import your own custom tone via a computer or GarageBand app.

How to change the ringtone on iPhone with default sounds:

• Settings > Sounds & Haptics > Ringtone > Pick from preset list.

How to set a custom ringtone:

• Buy from iTunes Store: Open iTunes Store app > More > Tones > Buy and download > Settings > Sounds & Haptics > Ringtone to select it.
• Or create/import custom ringtones using GarageBand or via computer with iTunes or Finder, then sync and select the ringtone from Settings.

This method works on the latest iOS versions, such as iOS 18, and older as well.