You start explaining something important while the other person checks a message. They may not realise you need more attention than an ordinary passing comment.
Ask whether now is a suitable time to talk. If the subject needs privacy or concentration, say so and suggest another moment if necessary. Include an approximate duration where that helps the person choose.
Discuss interruptions realistically
Some people must remain available for care or work responsibilities. Ask what can be paused and what cannot. You may choose a shorter conversation or a different setting instead of making a rule that ignores those needs.
During the conversation, keep your own attention on the arrangement you requested. If an urgent interruption occurs, agree on how to resume. The useful aim is a shared expectation about attention, not an assumption that putting away a phone automatically solves every communication difficulty. At the end, confirm any decision that needs action so a focused conversation also leaves both people knowing what happens next.
