Embodiments are directed towards communicating using a mobile device that performs actions including. The dispensing end being formed of a circumferential wall having a thickness T1 and which forms a dispensing opening of a diameter Di1 and having a diameter-to-thickness-ratio Di1:T1 at the opening which is 13 or greater. Thereafter, when the wordline is set inactive again, insufficient charge remains in the memory cells coupled to the wordline to represent data such that the data stored in memory cells coupled to the wordline are erased.