When stated that you only "rent" ringtones, that is incorrect. You do purchase the ringtone, and you have it forever on that handset. When Sprint states that you have it for 90 days, it means that you can re-download anytime, as many times as you want, in the next 90 days. How do I know this?? 5 year Sprint customer, and I used to work for Sprint in the retail stores.
This is much better than what Cingular does as the only allow you 24 hours to download the ringtone, and if you don't, you have to repurchase it. How do I know this?? I currently work for Cingular.
When writing a review for a phone, I would be sure to have all the correct information before stating something that you have assumed.