Tricked Out

Hi I just received my unlocked motorola razr cell phone today. I am wondering on how to download ringtones on it. I use myphonefiles.com with my old v400 using T-mobile service. With this, I usually would receive the file as a MMS and then all I have to do is use "go to" to download my file with GPRS service. However, with my unlocked razr, I can receive the MMS, but unable to download when I use the "go to" function. The phone would display a "NO GPRS service available" error. Is there a way to correct this?

Many thanks.

CC