I recently signed up at Bandcamp to download this great cover of Daft Punk’s “Get Lucky” by Beats Antique, and when I clicked on the link in my iOS mail app I received a message that I could not download the track to my phone, I had to do it via iTunes.
Fortunately, there’s a hack for that.
Download the iCab Mobile web browser to your phone. In the Tools, under Browser ID, choose Safari 6 (Mac). This tells the server that you’re on a desktop, not your iPhone.
Copy the download link and paste it into the iCab address bar, and choose to download the MP3. You’ll see the download progress at the icon that looks like a down-facing arrow surrounded by a circle. When the download is done, tap on that icon and you’ll see all your iCab downloads. From there, you can open the MP3 in another app (“Open in an External App…”). You can save it Goodreader or Dropbox, for example.