There's nothing more frustrating than heading out with a fully charged phone to find it completely dead just a few hours later.But you may be surprised to know that battery drain is often worsened by the so-called 'vampire setting' hidden deep within an .Despite its terrifying nickname, the life-sucking feature is more blandly known as 'Wi-Fi Assist' and allows Apple users to hop on to mobile data when networks lag behind.
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