The invention includes methods in which silicon is removed from titanium-containing container structures with an etching composition having a phosphorus-and-oxygen-containing compound therein. The water filtering inlet of the emitter is located entirely at the sides of the disc shaped body. All the image data mapped back to the reference time are added together. The method can further include the VVM system receiving a request for the new voicemail message, and sending the new voicemail message to the mobile device for storage and playback on the mobile device. The chip is transparent to electromagnetic radiations, and the PSU has at least one optical deflecting element for guiding received radiations through the chip, for establishing direct optical path coupling between an optical element formed on the first surface and an electronic element formed on the second surface.