United Kingdom, April 29 -- Katherine Heigl thinks her children are "far more creative" after she limited their phone usage.

The former 'Grey's Anatomy' star and her husband Josh Kelley - who have kids Naleigh, 15, Adalaine, 13, and eight-year-old Joshua together - have noticed the benefits of their daughters not being allowed their smartphones for half the week.

Katherine told E! News: "Naleigh has started baking and cooking a lot because I now I have a rule about the phone: They don't get it three days a week and they only get it after school. "Adelaide, she talks about wanting to be an actress."

She has also noticed an improvement in the relationships between her children as a result of the rules.

She added: "[Adalaine] and her bro...