A polite way to express your concern about someone spending too much time on their phone could be:
"I hope you don't mind me mentioning this, but I've noticed that there's been quite a bit of phone usage recently. I value our time together and would love to have more meaningful interactions without distractions. Is there any way we can find a balance that allows us to enjoy each other's company fully?"
By using "I" statements and expressing your feelings without directly blaming or criticizing the other person, you show that you care about the relationship and want to find a solution together. It opens the door for a constructive conversation about finding a healthier balance between screen time and quality time spent together. Remember, approaching the issue with understanding and empathy can lead to a more positive and receptive response.