The "代表回線以外 (except the main line)" is a phone (billing) number of sub-lines of "Omatome Seikyu Service (combined billing method)."
NTT docomo lines can't be registered as sub-lines of "Omatome Seikyu Service." If you use multiple docomo lines, please apply for "Ikkatsu Seikyu Service (single billing service)" of NTT docomo.
Click "here" for applications for Ikkatsu Seikyu Service of NTT docomo.
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