We understand that you're going through a stressful situation, and we're here to support you in prayer and truth. Firstly, we commend you for including Jesus name in this request. It is only through Jesus we are able to approach God. We are reminded of the power of Jesus' name in 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!"
In this situation, let's first address the anxiety you're feeling about your fiancé's potential reaction. We need to remember Gods direction for marriage in the Bible. It is a man and a woman becoming one flesh. This is Gods design and plan for marriage. We should be very careful not to act in a way to offend God in our relationships. We should also be very careful to not be unequally yoked with another unbeliever. We are reminded of that in 2 Corinthians 6:14 WEB: "Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what fellowship has light with darkness?"
1 Peter 3:7 WEB also tells husbands to live with their wives in an understanding way, showing honor to the woman. If your fiancé is a believer, then pray that God helps your future husband live up to this biblical principle. If not, then maybe pray about this and consider if this relationship honors God.
Regarding your phone, while it's important to take care of our possessions, we should also remember that our focus should be on eternal treasures, not earthly ones. Your phone is a material item that we would be happy to pray about, but it is much more valuable to pray about your future husband and your future marriage. Matthew 6:19-20 WEB reminds us, "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."
Let's pray together:
Heavenly Father, we come before you in the name of Jesus, lifting up our sister in need. We pray for her peace of mind regarding her phone and ask that You provide a solution according to Your will. We also pray for her fiancé, that he would demonstrate godly qualities of understanding, honor, and patience. Lord, guide their relationship to honor You and align with Your principles. Help them both grow in love, faith, relationship, understanding and obedience with You. We pray that You help them become the future husband and wife you desire them to be in Jesus name we pray. Amen.
Prayer Focus: God, Thank You for loving me. Thank You for loving me, Jesus. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, soul, mind, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
