Staying in a hotel with crappy Wi-Fi is frustrating, but not half so frustrating as finding this out by starting up your phone, connecting, realizing there's no Internet access, then manually disabling Wi-Fi to make sure it goes back to 3G or LTE. In Lollipop, Android 5.0 will do that for you: when the system sees no connection to the Internet (or more probably Google servers) via a Wi-Fi connection on a device with a cellular radio, it will automatically default to mobile data to keep an active connection.

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