Half of the UK’s 10-year-olds own a smartphone, with the amount of phone owners doubling between the ages of nine and 10. Speaking to children in a high-pitched voice can add 40 words to a baby’s vocabulary, and Huawei helps teach deaf children to read through an app. Finally, Heinz and Fortnum & Mason couple up for Valentine’s Day. All this and more, on this week’s Headliner.