Wells Fargo will RARELY unsecure your secure credit card. That has been the experience of almost everybody that has reported on this forum. They will make you apply for a new card/account and there is no guaruntee they will approve it. Even after 18 months. One of the main reasons I didn't go for their secured card way back when even though I had all my checking and savings with them.
When I first came to the US in 2009 I heard many bad things about BofA but my DW and I have both found them to be very helpfull CC company.
Also something very interesting is that I did NOT pay in full every month. My limit was $500 but I always left a balance of less then $10.