What network does Talk Mobile use?

Could you please clarify for me which network Talk Mobile utilizes for its services? I'm curious to know if they operate on a specific carrier's infrastructure or if they have their own dedicated network. Understanding this information would be helpful in assessing the reliability and coverage of their services. Additionally, I'm also interested in knowing if Talk Mobile offers any unique features or benefits that are tied to their network choice. Thank you for your assistance in clarifying this matter.