You might get a special one for Dad

• Cellphone customer's creation, perhaps
• Caller ID, maybe
• Cell phone alert
• Nitrogen affected sound of handset
• Downloadable ditty
• One's heard on the phone offering to negotiate, to some extent
• Caller ID, perhaps
• Cellphone alert

Wikipedia Word definitions in Wikipedia
A ringtone or ring tone is the sound made by a telephone to indicate an incoming call or text message . Not literally a tone nor an actual (bell-like) ring any more, the term is most often used today to refer to customizable sounds used on mobile phones ...

Wiktionary Word definitions in Wiktionary
alt. the sound made by a telephone when ringing, especially the customizable tone of a mobile phone n. the sound made by a telephone when ringing, especially the customizable tone of a mobile phone