日本におけるKDDI (au)と旅行用eSIM

KDDI (au)の概要

KDDI (au) shut down its CDMA 3G network on 31 March 2022; its network now runs on 4G LTE and 5G.

au (KDDI)'s bands and technology

An eSIM can only use au (KDDI) if your phone supports at least one band in this table. Before you fly, open your model's spec page on the maker's site and compare its LTE and 5G band lists.

au (KDDI)'s coverage map

au (KDDI) publishes its own coverage map. Look up the street or district you will stay in rather than the country as a whole, because coverage in town and out of town differs a great deal. The map shows au (KDDI)'s own network; a roaming plan may not get every technology it shows.

Open au (KDDI)'s coverage map

Who licenses au (KDDI)

Mobile networks in Japan are licensed, and their spectrum assigned, by the Ministry of Internal Affairs and Communications (MIC). The bands above are the ones it allocates. A problem with the local network's own service goes to the operator first; a problem with your eSIM plan comes to us.

当店で取り扱うプランのうちKDDI (au)を記載しているもの

From the supplier record behind each package, 117 of the 129 plans we currently sell for Japan declare KDDI (au) as a network the profile can reach, at 4G and 5G. The figure comes from the same catalogue that prices the plan pages, and it moves when the supplier revises the record.

au (KDDI) beside the other networks in Japan

プランが特定のネットワークを名指ししない理由

Nearly every travel eSIM is a roaming product: the profile picks a network by an order the supplier sets, not by the buyer. If KDDI (au) is weak where you are, try selecting NTT DOCOMO or Rakuten Mobile or SoftBank manually in the network settings, and keep data roaming on for the eSIM profile.