Device structures, design structures, and fabrication methods for a varactor. A plurality of releasable connectors retain photos, collectible items or other valuables in the cavity. A second landing-pad API is hosted and accessible from a second POP. When the subscriber identification data stored in the memory unit of the mobile terminal does not match that of the subscriber identification module card installed within the mobile terminal, the mobile terminal sends a message to the caller alert group via the communications network.