This paper focuses on facilitating state-of-the-art applications of big data analytics (BDA) architectures and infrastructures to telecommunications (telecom) industrial sector.Telecom companies are dealing with terabytes to petabytes of data on a daily basis,IoT applications in telecom are further contributing to this data deluge.Recent advances in BDA have exposed new opportunities to get actionable insights from telecom big data.These benefits and the fast-changing BDA technology landscape make it important to investigate existing BDA applications to telecom sector.For this,we initially determine published research on BDA applications to telecom through a systematic literature review through which we filter 38 articles and categorize them in frameworks,use cases,literature reviews,white papers and experimental validations.We also discuss the benefits and challenges mentioned in these articles.We find that experiments are all proof of concepts (POC) on a severely limited BDA technology stack (as compared to the available technology stack),i.e.,we did not find any work focusing on full-fledged BDA implementation in an operational telecom environment.To facilitate these applications at research-level,we propose a state-of-the-art lambda architecture for BDA pipeline implementation (called LambdaTel) based completely on open source BDA technologies and the standard Python language,along with relevant guidelines.We discovered only one research paper which presented a relatively-limited lambda architecture using the proprietary AWS cloud infrastructure.We believe LambdaTel presents a clear roadmap for telecom industry practitioners to implement and enhance BDA applications in their enterprises.