How do I use the Walkman on a Sony Ericsson phone without putting a sim card in the phone?

I have W580i, and its sim locked with Orange. I borrowed my sim card to a friend and I can’t get it back till I get to Ireland…
I ordinarily listen to the walkman on my running away back to Ireland (12 hours!!) So I just want to know if anyone knows how I can use my Walkman (like the running away mode) without inserting a sim.

Related posts:

  1. Does any one know what type of memory stick or card goes to the Sony Ericsson Walkman phone?
  2. Which is the best Sony Ericsson Walkman phone?
  3. Whats the best Sony Ericsson Walkman phone ?
  4. How to slide the back off of a Sony Ericsson walkman phone?
  5. How do you upload videos from the Sony Ericsson walkman phone on to the computer?