Another way to create a tonos para celular de llamadas is to record the audio clip on your phone. If you are using an iOS or Android device, you can use the app's recording capabilities. Once you have recorded the desired sound clip, save the MP3 file to your device. A ringtone should be approximately 15 to 30 seconds long, so you don't want it too short. The file size of a ringtone is typically 300 KB.