To make ringtones for iPhone, you can follow these steps:

Choose a Song: Select the song you want to use as a tonos de llamada. Keep in mind that the song should be in a compatible format (such as MP3 or M4A) and not protected by digital rights management (DRM).

Trim the Song: If necessary, you'll need to trim the song to the desired section for your ringtone. You can do this using software or apps on your computer or directly on your iPhone.

Using a computer: Open a music editing software like iTunes (Windows) or GarageBand (Mac) and import the song. Trim the song to the desired section, keeping it within 30 seconds (the maximum length for an iPhone ringtone).

Using an iPhone: There are apps available on the App Store like GarageBand or Ringtone Maker that allow you to import a song and trim it directly on your device.

Convert to AAC Format: To create an iPhone-compatible ringtone, you'll need to convert the trimmed song to the AAC audio format.

If using iTunes: Right-click on the trimmed song, select "Create AAC Version." iTunes will create a copy of the song in AAC format.

If using GarageBand: Export the trimmed song as an AAC file.