I tried this out in my relationship and it has been so helpful in communicating through conflict.
"I appreciate..." Described a specific event, things, or area that happened recently.
"I feel..." Identify a positive or negative emotion that has occurred.
"I want..." Name the need or desire you have.
"I appreciate you spending time with my family. I feel frustrated that you spent 50% of your time on your phone while we were with them. I want you to spend less time on your phone the next time we are at a family event."
Give this a try and let me know your thoughts!