Explanation
Adding more support phone lines is a solution that can address the problem of the support team being unable to provide same-day customer assistance due to high demand. Adding more support phone lines can increase the capacity and availability of the support team to handle incoming calls from customers. This can reduce the wait time and improve customer satisfaction. Verified References: :
https://help.salesforce.com/s/articleView?id=sf.service_phone_overview.htm&type=5 :
https://help.salesforce.com/s/articleView?id=sf.service_phone_setup.htm&type=5

Explanation
Field Service Lightning is a product that enables you to manage your mobile workforce, optimize schedules, track inventory, and resolve issues in the field. Field engineers can use the Field Service Lightning mobile app to access current inventory levels of products the customer has purchased while at customer sites. They can also view their assigned work orders, get directions, update statuses, and capture signatures. Verified References: Field Service Lightning Overview