secured card to unsecured card is not possible right now..
onecard said that they will convert secured to unsecured after 6 months but not a single card is converted to unsecured one yet from the date of launch..
you can't break fd without closing the card.. and once you close the secured card you can't signup again or get new card again ever..
some people said that they used another mail and mobile no for new account signup after closing the old account..