I don't have BOA but I have had Usbank and they said unsecured after 12 months... After 12 months they declined me for unsecured and I only had $300 limit.
So I too asked the same question regarding my new secured orachard bank... adding more to it.
1 person responded and said they were declined after year for unsecured.
So I'm starting to think that banks are not as good about unsecuring a card as they say.