Well, you could turn off the phone when you know you'll be listening to music on a windows phone and then all your calls will just go to voicemail, but even so there are many other limitations when replacing a dedicated Zune Player with a windows phone:
- Windows Phones don't have the amount of memory you'd want to have for a dedicated mp3 player. Currrent Windows Phoines have about 8 GB of memory in total.
- Battery life on a phone just isn't as long as the battery life on a ZunePlayer. I need my phone, so if I have to make a choice between listening to music for several hours versus preserving the battery in my phone for phone calls I might need to make,
I'll preserve the battery life on the phone.
- Accessories, windows phone doesn't use the same port as Zune Players and currently windows phones don't provide such an easy way to view video on the phone on a television screen. The Zune HD and its related AV dock (that includes HDMI and optical digital
audio ports) provide the best listening and viewing quality via a digital television or stereo system than windows phone can provide (at this point).
I love my Windows Phone, but I also love my Zune HD. In fact, I love my Zune HD so much that I
just bought another one from Best Buy, where you can get a refurbished Zune HD (32 gb) for a great price (for the time being anyway).