概說(Introduction)
自從2015年5月1日日本總務省發布了規範SIM卡綁定的相關條例的解除(SIMロック解除の義務化)之後，從2010年就開始的手機自由化可以算是走到了一個新段落。話說從頭的話，就是日本的通信業者由於在手機販賣上各家削價競爭的緣故，這些便宜的方案到頭來其實還是要消費者長期的契約來達到回本的效果。因此，為了防止消費者跳槽，日本的4大業者都採用了SIM卡綁定的方式(不像台灣是違約金)來確保成本能夠回收。不過也不要覺得日本很奇怪，根據維基百科，美國的4大通信業者也有3間都採用同樣的手法。總之，隨著此項風氣的散去，近日日本的電信方案可以說是百花齊放、眾家爭鳴，想當然爾，對於消費者而言，適合自己的選擇也能變多。不管是家族一起的方案，或是學生方案，或是不想要綁約的留學生方案(我是這麼叫它啦...)，現在都有很多選項可供考慮了。(因此，我來到日本之前特地為了手機研究了一陣子....)(English Translation:
Since 2015.05.01 the Ministry of Internal Affairs and Communications of Japan asked domestic service providers to unleash the SIM lock regulations, the progress of cell phone liberalization has been coming to a new era. Long story short, because Japan mobile service providers compete strongly against each other, they have to redeem their lost during price down by constraining their customers with long-term contracts which came with a provider-based mobile phone model design. And that modification limited the compatibility of Japan mobile phones. But don't blame Japan too soon, because as Wikipedia said, in the US, 3 out of 4 of major service providers in the US employs this kind of approach to do the same thing. Anyhow, for customers like us, it turns out that we could have more cheap plans than we did before, so let's think in a more positive way lol.)
以下開始介紹我所知道的資訊，我會從現有的方案開始介紹，然後再介紹概括的使用流程，因為不才如我也只用過其中一家，對於其他同類的廉價SIM卡廠家的方式如果有出入還請指正^一^
(English Translation:
I will introduce you to the information I have known from the basics to application procedures needed, but my knowledge is limited, so please correct me if I am wrong.)
首先來個概略的介紹的話，就是
1.廉價SIM卡跟斯斯一樣分為三種，主要有純上網用(データ通信SIM）和可以發簡訊(SMS対応SIM)和可以打電話又可以上網(音声SIM)的三種。每個月繳的費用由前往後增加。仔細想想不需要緊急聯絡或是做大事業的人其實前面兩者就可以了。要用ＬＩＮＥ或其他會發驗證碼到手機的網路服務的人必須要用可以對應ＳＭＳ的ＳＩＭ卡，因為純上網的ＳＩＭ卡是沒有獨立電話號碼的。
2.通常需要一張信用卡(誰的都可以）來當作每個月付款的手段。(非常重要!!)
3.有的要綁約，有的不用。(我使用中的OCN就不用綁約，熱門的b-mobile就有限制使用5個月以上。)
4.在確定要使用之前請先確定自己的手機是"動作確認端末"，否則到時候都買來了不能用。
５．像是我用的OCN mobile ONE有提供可以撥接電話的純上網SIM卡，方法是利用IP電話的概念(像是SKYPE一樣)，要撥接都得開行動網路才行(我就是用這種，搭配的就是050開頭的號碼，有點像是半殘的電話號碼。有一些號碼無法撥通，包含一些免費撥接電話和緊急電話110.119等。詳細點此) 。
(English Translation:
First of all, the basics :
1. Kakuyasu sim card can be classified into 3 kinds in large, Data-only(データ通信SIM) and Data + Text Message(SMS対応SIM) and Data+ Text Message + Phone calls(音声SIM). The monthly fee will increase as the functions are included. If you need to use LINE or other online services that require cell phone verification or the like, please select SMS対応SIM since the Data only ones come without phone number.
2. You need a valid credit card(you can use anyone's card.) to achieve monthly payments.(Important!!)
3. Some plans have minimum contract period, some don't.( the provider I'm using doesn't require that, but some also popular ones require 5 months or more )
4. Make sure your device is compatible.
5. The one I'm using (OCN mobile ONE) provides Data-only sim card with IP telephony service combination, and they also have discount for that. Details in English
日本語が分かる冒険者へ(For those who read Japanese)
傳送點我(Compare plans)
上面的連結是我找了許久才找到的總結網站，裡面有當今日本絕大多數的留學生適合的方案可供參考，但是從價位上來說，對於長期居住的人也是非常適合的。不過要注意的是，大多數的公司都是用4大通信業者的線路來提供服務，所以在挑選的時候，該業者使用的線路也是一個重點。
(English Translation:
The link above will direct you to a summary website that tells you everything about Kakuyasu sim card, and hopefully you will be able to find one that fits you the best. Since these plans are provided by minor companies using major service provider's networks, when you compare among them, you may want to pay attention to the service provider they use.)
有幾個主要業者提供每個月改變方案內容的服務，例如一個月3G太少不夠用，下個月提升到5G，而且只要在手機上的業者提供的APP動動手指就可以完成申請；或是提供高速開關的服務，如果想要節省流量使用的話，可以平時把高速開關關上，這樣就只會用低速上網(但是對於LINE或是FB文字瀏覽其實是足夠的)，就不會用到流量了。
(English Translation:
There are some companies provide you with monthly adjustment service, for instance, if you want to lift the capacity from 3G/month to 5G/month just on your phone with their APP; or you want high speed switch that help you with using your capacity economically.)
講這麼多，其實看得懂日文的點進去上頭的網站看一看就都會懂啦。
(English Translation:
Sorry to be verbose, if you will, you can just click on the link above and check for yourself.)
主要流程(Procedures)
(English Translation:
Because I don't feel like advertising the service I am using( also since I am a bit tired lol), I will concisely summarize the procedures you might be interested to know. )
1.確定自己的手機是動作確認端末之一，然後訂購和自己手機的SIM卡SIZE一樣的SIM卡包。可以從Axxzon.jp或Rxxxten買到，也可以去找實體店鋪，不過因為展店通常不多，可能網購比較方便。
2.取得該公司的SIM卡包(通常會含有SIM卡和申請流程所需的SIM卡資訊)。
3.照著SIM卡包的提示進行登錄手續，這時候你會需要信用卡、現住地址的資訊在你手邊，也有可能會需要一個朋友的日本手機號碼(不能是050開頭)來接收驗證碼(就跟LINE的驗證碼一樣的東西)。
4.結束。
(English Translation:
1.Make sure your cell phone is compatible, and order the SIM card pack corresponding with your cell phone's SIM card Size(there are nano, micro, standard...). Usually you can get one from Amaxxx.jp or Rakuxxx, or pay a visit to their shops, however, net purchase is often faster.
2.Getting your SIM card pack.(Usually comes with the SIM card and manual with registration info.)
3. Follow the instructions to complete registration procedures, this is the time you will need a credit card and your residence address beside you. Also you might need a valid cell phone number in Japan(cannot be 050 numbers.) to receive verification password( like the one LINE ask you to type sometimes when you login in a new device)
4. Done.
看在我熬夜從12點敲鍵盤到3點的份上，別太苛責我說明得不夠有條理吧XD
算是我去年9月的記憶的剩餘部分和使用後的經驗，祝各位辦手機順利囉~
Given that I wrote these words down from 0 A.M to 3 A.M, please don't blame me too much for being verbose and illogical lol. Last but not least, best wishes for all you coming to JP!
