Looking for logging into the Salesforce1 site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Salesforce1 site. After that you can login as usual with your login credentials.
https://login.salesforce.com/?locale=jp
https://help.salesforce.com/apex/HTViewHelpDoc?id=networks_access_in_salesforce1.htm&language=ja
https://developer.salesforce.com/forums/?id=906F00000009BhpIAE
https://www.synergy-marketing.co.jp/blog/salesforce1-easy-mail-to-contact-app
http://blog.flect.co.jp/salesforce/2014/11/salesforce1-2b81.html
https://salesforce.stackexchange.com/questions/165187/not-able-to-login-to-salesforce-1-mobile-app
https://books.google.co.jp/books?id=CY52BgAAQBAJ&pg=PA17&lpg=PA17&dq=salesforce1+login
https://books.google.co.jp/books?id=mLkrDwAAQBAJ&pg=PA330&lpg=PA330&dq=salesforce1+login
https://play.google.com/store/apps/details?id=com.salesforce.chatter&hl=ja
https://qiita.com/a_kuratani/items/f1cd6b02381cfb7e0381
https://success.ringcentral.com/articles/RC_Knowledge_Article/8995
https://dackdive.hateblo.jp/entry/2015/10/29/100000
https://www.jinya-connect.com/images/library/File/media/manual/chatter_manual.pdf