Calling between US mobile phones in Japan


    I have following questions:

    1) Is there any difference in dialing sequence between regular and wifi-calling when using roaming in Japan?

    2) Can I use + prefix to call between US mobile phones in Japan? If not what should I use?

    3) Can I use + prefix to call Japanese phones from my T-mobile one phone?

      All replies

      • drnewcomb2

        All phone numbers should always be entered using the + notation. If a number is from NANP (e.g. Canada, US) it begins +1 since 1 is the country code for NANP. Japan's country code is 81 so Japanese number should begin +81. Generally, if you are given a foreign number begins with zero(s), you drop the leading zeros and prepend the country code. One exception to this rule is Italy, where phone numbers can actually begin with a "0" and rewriting can require a bit more information.