A mobile telecommunications device is disclosed and comprises a casing (2), an earpiece (6), and a cover (33) associated with the earpiece (6) to define a resonant cavity (34) between the earpiece (6) and the casing (2), wherein the cover (33) has an opening therein for the transmission of sound from the earpiece (6) via the cavity (34) into an acoustic path formed between the casing (2) and the cover (33).

 
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> Position specifying system, information collecting system, internet connecting system, and method of the same, and storage medium storing therein program thereof

> Banded billing system for telecommunication service
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