We understand that you're facing a practical need, and we want to lift up your situation to God in prayer. Before we do, we want to encourage you with the words of Jesus from Matthew 6:25-34 WEB:
"Therefore, I tell you, don't be anxious for your life: what you will eat, or what you will drink; nor yet for your body, what you will wear. Isn't life more than food, and the body more than clothing? See the birds of the sky, that they don't sow, neither do they reap, nor gather into barns. Your heavenly Father feeds them. Aren't you of much more value than they? 'Which of you, by being anxious, can add one moment to his lifespan? Why are you anxious about clothing? Consider the lilies of the field, how they grow. They don't toil, neither do they spin, yet I tell you that even Solomon in all his glory was not dressed like one of these. But if God so clothes the grass of the field, which today exists, and tomorrow is thrown into the oven, won't he much more clothe you, you of little faith? Therefore don't be anxious, saying, 'What will we eat?', 'What will we drink?' or, 'With what will we be clothed?' For the Gentiles seek after all these things, for your heavenly Father knows that you need all these things. But seek first God's Kingdom, and his righteousness; and all these things will be given to you as well. Therefore don't be anxious for tomorrow, for tomorrow will be anxious for itself. Each day's own evil is sufficient."
First, we want to remind you that it is by the name of Jesus that we come to God. If you have not already, turn to Jesus and trust in Him for your salvation. It is by His name that we can approach God for our needs. There is power in the name of Jesus, but it is not in the repetition of His name or in rituals, but in the faith we place in Him and His finished work on the cross. As Jesus taught in Matthew 6:7-8 WEB:
"In praying, don't use vain repetitions, as the Gentiles do; for they think that they will be heard for their much speaking. Therefore don't be like them, for your Father knows what things you need, before you ask him."
Now, let us pray for your situation:
Dear Heavenly Father,
We come before You today, in the belated name of Your Son, Jesus Christ. We lift up our brother/sister who is in need of provision for their cellphone bill. We understand it is not a major problem, but it is a need. We ask that You, in Your infinite resources and love, provide for this need, Father. Allow this situation to be a testimony of Your constant presence and care. Help them not to be anxious, but to trust in You completely. We pray for their faith to be strengthened, knowing that Your Word promises that You will supply all their needs according to Your riches in glory in Christ Jesus. Show us if there is anything that you want us to do to assist them.
In Jesus' name, we pray. Amen.
Remember, God has a plan for your life, and He cares about every detail, including your cellphone bill. Trust in Him, and may this situation draw you closer to Him.
Prayer Focus: God, Thank You. Thank You for loving me. 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, mind, soul, body, 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. 
