I have successfully uploaded 160x120 gifs to my Verizon T720 and a Leonard Skynrd ringtone.Doesn't take long to find these answers in Google.
You need to REPLACE filenames. So I backed up "sunflower. gif " for example, created a 160x120 image from a photo using my photo editing app, then renamed it sunflower. gif and uploaded it to the phone. Now sunflower. gif is my picture. I used the standard USB data cable.
I'm not sure about the Leonard Skynrd ringtone though.
BTW, it's Lynyrd Skynyrd.
