I too have the BoA partial secured Visa Platinum, or the 99/500 cc as we put it.
3 weeks ago I requested a cli, and they sent me a letter that on this particular cc, there is no cli available to it.
But the CSR I talked to after I got the letter told me with pristine pay history, no over the limit, it will be moved into an unsecured card status in a year.
Hope that helps.