今回はiOSおよびAndroidで利用でき、電話番号やメールアドレスの登録を必須としない「知る人ぞ知る」プライベート重視のSMS3つのアプリを紹介する。後ろめたい用途に使われると誤解されがちだが、災害などで既存インフラが一時的に利用不可に陥った場合の対策としても役立つので慣れておいてはいかがだろうか。
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