Im also looking for what info is needed. I have something to add though. I have successfully ported a number off to Verizon. But this was not without a hitch. The hitch was while in Verizon Store with the Rep - we put in the phone number xxx-xxx-1234 as the account number. Almost instantly on the line - the customer service lady says "we've received a delay notice from Straight talk". To me this sounds some info (account No) was incorrect and the porting system gave a message that this would need more work - i.e. VZW calling ST.
I then waited a good 20 hours - then proceeded to write an email to ST - asking the number to be ported.
I got a call back from ST saying the number had been released to Verizon. It should be noted - when I ported from Sprint into Striaght talk it was relatively hassle free.
So the morale of the story - the phone number is most likely not the account number.