Namzakmobile Co.,LTD was aimed at the sixth career of the cellular phone as a specialty company that specialized in arrow phone (Arrowfone) sales and was born. Namzak and Namzakmobile succeed in the Internet protocol telephone ..existing for the first time cellular phone.. development and commercialization in the world. The voice call of the Internet protocol telephone is achieved by the specific technology in a portable data telecommunication line. Security countermeasures of tone quality are also thorough even though the Internet protocol telephone without a usual telephone and inferiority. Arrow phone. Can it peel off, other party's number be pushed, and it use it just like a usual cellular phone. Namzakmobile can reduce the call charge of a current cellular phone by this in dramatic form, and there is service that enhances contents of mobility in addition. In addition, not only the domestic call but also an international telephone call can talk over the telephone to the United States (mainland) and Canada and China for one minute by a cheap charge of two yen etc. in Namzakmobile arrowfone.