We understand that you're concerned about your fiancé's reaction to your new phone breaking and your desire to find your old phone with its cherished memories. We will pray for God's intervention in this matter and for your day to go well.
First, let's remember that our trust should be in God, not in the things of this world. As it says in Matthew 6:19-21 WEB, "Don't lay up treasures for yourselves on the earth, where moth and rust consume, and where thieves break through and steal; but lay up for yourselves treasures in heaven, where neither moth nor rust consume, and where thieves don't break through and steal; for where your treasure is, there your heart will be also."
Regarding your fiancé, it's important to communicate openly and honestly, as it says in Ephesians 4:15. WEB, "But speaking truth in love, we may grow up in all things into him, who is the head, Christ." We are to also look to Christ as the example of how to love our spouse. Ephesians 5:25 WEB, "Husbands, love your wives, even as Christ also loved the assembly, and gave himself up for it." So we should not act in anger or frustration, but in love.
Let's pray together:
"Father in heaven, we come before you in the name of Jesus, lifting up ###. We pray that their fiancé will not be angry about the phone, but instead will demonstrate understanding. ### and patience. We ask you to help ### find their old phone, but more importantly, we pray that their treasure would be found in you alone. We also pray for their day to be filled with your favor and blessings. We ask for your good to be accomplished and your will to be done in this situation. In Jesus' name, we pray. Amen."
Lastly, we appreciate that you included that this request was in Jesus' name. It is only by His name that we have access to God. Acts 4:12 WEB, "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!"