Let's Encrypt warns phones running Android 7.1 or older won't connect to many secure websites starting in 2021 as they will no longer trust its root certificate (Corbin Davenport/Android Police)

Corbin Davenport / Android Police:
Let's Encrypt warns phones running Android 7.1 or older won't connect to many secure websites starting in 2021 as they will no longer trust its root certificate  —  It took a long time, but most of the web now uses HTTPS to securely transmit information, partially thanks to a push by Google.