Praying in my own words requires my full attention. No multi-tasking when speaking personally to the Most High God.
It's easy to become distracted of course, but God knows that. He made us and he knows most of us are like a dog when it spots a squirrel. The chase is on, whether the distraction is our phone or another person.
Believing in my prayers helps me focus deeply and avoid distraction. That's all I understand.