You are not giving all the info we need to help you. Not trying to be a smart ass but you really need to go into detail with your answers.
1. You said that WMP transfered songs to your phone in wma format.
you said that you see them in the MyMusic. Can you play them in the sounds player???
2. You also said yea i can do that to edit phonebook and assign ringtones. You did not say which songs that you assigned. Is it those that came with the phone or the wma's that windows transfered????
3. Did you try the funformobile.com link i suggested for transfering mp3's to your phone??? If so what were the results!
If you can tranfer and assign songs in the wma format as ringtones why bother with mp3. Wma's take up less memory than mp3
4. Did your phone come with a cd that has the software on it for transfering mp3's wma's ??
5. Are the phonebook entries that you are trying to assign a ringtone to stored in your
sim card or the phone? I think they have to be in phone memory to asssign ringtones to them.
According to phonescoop.com you phones music player supports wma,mp3 and aac formats
also check out the how to at
Mark_Venture's V710/E815 Info
Again not trying to be a smartass, just that the more info you provide the better.