This paper presents an in-depth literature review of the challenges faced by English as a Second Language (ESL) learners in writing, with a focus on the role of Mobile Artificial Intelligence (AI) in addressing these issues. ESL learners often struggle with mastering English syntax, structure, and vocabulary, and understanding the conventions of academic writing. These struggles are often compounded by a lack of feedback due to limited resources and time available to teachers. Mobile AI has emerged as a potential solution, offering the capacity to process vast amounts of data on the go, personalize learning experiences, provide immediate analysis and feedback, and even generate writing templates. However, the reliance on Mobile AI also raises several concerns, including the potential for over-reliance on the technology, the inability to provide nuanced feedback like a human tutor, biases in algorithms, and the risk of promoting repetitive, 'robotic' language. Thus, this paper explores the advantages and potential pitfalls of using Mobile AI in ESL writing, arguing for a balanced approach that harnesses the strengths of this technology while remaining aware of its limitations.