普段Wifiでネットをしているのであまり気にしていなかったのですが、iPhone5本体でアップデート、所謂OTAでアップデートをするとdocomoで使っているiPhone5の場合、LTEが無効になってしまう場合があります。
その際は、PC / Mac にiPhoneをつなぎ、iTunesの上記の画面からShift(Macはoption)を押しながら「アップデートを確認」を押してファームウェアのファイルを選択して差分アップデートすると無事繋がるようになります。
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