What carrier does Altice use?

Excuse me, could you please clarify for me what carrier Altice utilizes in their operations? I'm trying to get a better understanding of their infrastructure and how they facilitate their services, so knowing the specific carrier they rely on would be quite informative. I'm hoping that with this information, I can gain a deeper insight into their business model and how they manage to deliver high-quality services to their customers. Thank you in advance for your assistance.