I used to think the whole ringtone deal was only a bunch of BS for kiddies. However, it's a huge money maker for some cellular carriers. My cellular carrier, Verizon makes it nearly impossible to create ones own ringtones. A concerted group effort has been going on to create ringtones for the new Nokia 6256i and due to the use of protected files, it's so far, impossible to make one's own ringtones for each contact.
I started to see the value in assigning an identifiable sound to a few VIP callers, to let me know who's calling, without looking at the phone, provided it's appropriate to have a ringing phone at all. Animal sounds make it easier for me to remember, it's also a small guilty pleasure too!
A custom tone for an individual caller is a very handy feature, under certain conditions, say an emergency/prority calling, like elderly parent, pregnant wife, work, etc, which can be quickly identified while driving, where one may generally not want to be distracted. Allows for the quickest recognition and call back without looking at the phone.
FYI, there's a nice piece of software for Mac's and (Verizon+ others) Nokia's called Phonedirector, which allows a great deal of Bluetooth connectivity for those Nokias, which had been PC only.
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David