Family telephone discounts for same-sex couples provided by au & NTT Docomo, following Softbank 

As of July 18th, KDDI announced family discounts for mobile phones, home phones, and internet will be applied to same-sex couples who have a public certificate issued by certain institutions such as Shibuya. Previously, they only accepted documents that prove a family (such as a resident card), and same-sex couples were an exception. However, after Shibuya-ku, Tokyo acknowledged same-sex couples as “relationship corresponding to marriage”, and worldwide debate over the advocacy of sexual minorities became active, these two corporations decided to come up with this policy. They, of course, offer this service to people who will have similar certificates in
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