The quick answer to this question is, YES.
You're next questions would probably be, what works/doesn't and how.
How, you've probably read on HoFo.
What works, making and receiving calls and sms only.
MMS, Boost Mobile is Sprint. No working MMS server settings for PDA/PPC.
Internet/EVDO, again you're on Sprint, there is no way for you to provision your new phone for data access to their network.
Note: Now as for the last part, I could make a suggestion; if you can access your current (already provisioned) phone's AAA/HDR/security settings and transfer them over, you "may" have something there..
-CC
P.S. Sprint SERO is a nice option.