The best way to get ringtones on the w755 is by using MSU (Motorola Software update) in conjunction with P2Kcommander v4.9.
Quick steps.
-install MSU and run it....leave it running.
-Get a USB data cable and connect your phone to your PC. Wait while windows installs all the drivers. You can tell your ready for the next step when MSU recongizes your phone, a 14 digit code should appear as your MEID Number in MSU. Leave MSU RUNNING.
-install P2Kcommander v4.9 and run it.
-in either the right or left column in the drop down box select /a P2k Phone system. Then hit the Re-Read button.
-the ringtones folder is located at:
a/brew/mod/my_ringers
-copy your ringtones over by using the copy button.
that's it. You can now have Custom ringtones.
I have had this phone for less then a month. I have done this numerous times. I even put custom ringtones on my father's phone from 200 miles away using remote desktop connection....all he had to do was connect the phone to the PC. 10 minutes later he had all the blues and rocks ringtones he could handle.