國內固網市場早期由中華電信獨占，直至民國90 年解除管制，三家民營固網業者進入市場後，但是業者間競爭仍然不像行動電話市場那般激烈，諸如原獨占者至今仍有九成以上市內電話業務的占有率，其中最重要的原因在於固網開放時，市話普及率
已飽和，新固網業者須從中華電信手中搶奪新用戶，然而更換業者須改變號碼的現況增加了用戶的轉移成本。因此，在克服其複雜性之後，即將於民國94 年的「號碼可攜」政策，使得用戶在更換業者後仍可保留原有號碼，大幅降低其轉移成本，拉近新固網業者與中華電信競爭基礎的公平性，因此業者會提供更好服務品質以及更低廉費率去
　　在這篇論文中，我們首先探討介紹國內外實施號碼可攜的技術與概念，及回顧國內外號碼可攜之相關文獻來建立國內號碼可攜效益的完整評估流程；國內外針對固網號碼可攜使用者效益分析進行評估的報告闕之閥如，但英國及香港早在1998 年即開始進行行動電話號碼可攜政策的效益評估，因此，本論文主要以這兩篇文獻的研究架構作為基礎，修正部份的評估項目，在固網號碼可攜效益評估方面，將固定網路電話用戶依號碼可攜對其所產生不同的效益來加以分群，建構各分類的使用者效益評估與加總之流程；透過合理可行的抽樣方法對國內固定網路電話用戶進行調查，研究方法主要是對台北、台中及高雄三大都會區固網用戶進行問卷調查，資料收集採各電信主要門市門口每隔三位出來的民眾請求其幫忙填答，有效樣本數為385 份。最後再假設不同的轉攜率之情境，進行估算國內實施號碼可攜十年所產生的淨效益現值；我們冀望本論文能作為電信總局號碼可攜政策的一個合適且嚴謹的學術上支持。
　　最後將本論文的研究結果概述如下：國內固定網路電話市場擁有低的顧客流動性，不管一般用戶或商業用戶曾換過業者的比例皆小於50%；調查研究中也發現號碼可攜政策將更形提高顧客轉換意願，亦即國內固網電話市場顧客流動性會因此提高。在號碼可攜效益的評估上，該政策的實施將為國內體整社會至少增加6,158 百萬元的十年淨效益現值，樂觀的情境下亦可能增加15,221 百萬元的十年淨效益現值；號碼可攜轉攜率的變動與用戶淨效益呈現正向的關係。因此建議電信總局應迅速確實的落實號碼可攜政策，使資源能有效利用以提高社會的福利。

　　Chunghua Telecom Company has dominated the main fixed line markets until the　ban on the markethas been released in the early 2000s.Three privacy-run fixed line　companies allowed to join the fixed line markets.But the competition of fixed line between　companies is not as severe as the cell phone markets do. Over 90% of city telephone
affairs are still operated by Chunghua Telecom Company. The dramatic factor is that the popularity of city phone usage has reached the required demand after the fixed line is permitted to others’ run, the fixed line company are able to attract new customers who are originally use the service of Chunghua Telecom Company, and the increased budget will be take into consideration while they transfer the original numbers into brand new ones.
Moreover, in light of overcoming the above-mentioned complicated issues, the policy
based on the number portability will kick off in the year of 2005. Telephone users can
keep original phone numbers as if they use another company. In addition, the good
benefits include decreasing the transferred budget and appealing new fixed line company
fairly to compete with Chunghua Telecom Company. Therefore, the fixed line companies
are willing to provide a great deal of best service quality, lower service charge, as well as
maintain their occupancy.
The major objective of this study is to introduce the number portability technology
and concept at domestic and international markets, review the related references, and
stipulate the efficient and valuable evaluation flow. Domestic studies concerning captioned
issues published are still insufficient. The evaluation of numbers portability projects has
been carried out by U.K. and H.K in the early of 1998.This thesis adopts thesis
frameworks and adjusts several evaluation items. In the evaluation of NP’s user benefit,
fixed line subscribers are sorted into different user types according to the benefits
generated by NP, and the procedures of user benefits’ evaluation and aggregation are then
constructed, via reasonable and feasible sampling methods, date collection is derived from
the questionnaire of fixed line subscribers in Taipei, Taichung and Kaohsiung metropolitan
cities. (The number of effective samples is 385). Finally, considering several scenarios of
NP churn rates, we estimate the net benefit derived from the 10-year implementation of NP
on domestic fixed line market. We hope this thesis can be a concrete academic support for
Bureau of Telecommunication’s NP policy.
The main findings of this thesis can be summarized as follows. The liquidity of
subscribers in fixed line market is relatively low and lower than half of ordinary
subscribers/business subscribers have switched operators. Further, NP increases the
inclination of subscribers to switch operators and thus promotes the subscribers’ liquidity
in the market. In the cost benefit analysis of NP, it will bring at least a N.T. $6,158 million
(and up to N.T. $15,221million) of the present value of 10-year net benefit to every fixed
line subscriber. NP churn rate has a positive impact on subscriber’s net benefit. Therefore,
Bureau of Telecommunications in Taiwan should promptly implement the NP policy to
promote social welfare.

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