I want to create my own ringtone from an mp3 file... Are there any sites to get a ringtone and send to my phone and sites that I can trust and that won't send me a virus?

I tried ventones and they ended up sending me a virus and I had to get a new phone

I just want a trusted site no matter if I have to pay but I don't want to pay monthly, just once...

I have a Virgin Mobile phone