A system and method for enabling a user to invoke a service over a signaling channel in a communication system with a communication device such as a mobile phone. The tactical clothing accessory can be a tactical magnetic keeper having one magnet or a plurality of magnets which can reversibly secure one or optionally more items such as a firearm, an ammunition clip, a pair of hand cuffs, a hand cuff key, a baton, a knife, a magnet, or other magnetic object. With this method, the surface of the soft silicone gel or the silicone hydrogel material can be completely coated with the hydrophilic biomedical material, so that a hydrophobic silicone dry spot on the surface resulting from a hydrophobic silicone component in the soft silicone gel or silicone hydrogel material is completely coated. A frequency response associated with the image produced using the second array exhibits effects.