Is it possible to join Smartone 3G (unlimited data) without signing a contract?

I was wondering if it is possible to join Smartone's 3G (unlimited data service) without signing any contract.

I want to join their service now but sign a contract next month when Sony Ericsson X10 releases.  So that I can get the X10 at a reduced price or free (based on their price).

Yes, at a much higher price