Do Verizon and AT&T use the same towers?

Are Verizon and AT&T utilizing the identical communication towers in their networks, or do they maintain separate infrastructures? Given the fierce competition between these two telecommunication giants, it's intriguing to understand if they share resources or if they've invested in distinct infrastructures to differentiate their services. It would be insightful to know if sharing towers would lead to any advantages or disadvantages for either company, and how it might impact the quality and coverage of their services.