We are a large manufacturing company with over 17,000 associates, about half of whom have company-provided cell phones. We average two lost devices per week, which seems low, but executive management is concerned and wants to know if our numbers are typical compared to other companies. My questions are: 1. Do other companies also struggle with lost or stolen devices? 2. What is the average number of lost devices per week? 3. Are there repercussions for associates who lose devices due to carelessness or negligence?

This is a very common situation, in Brazil. For this reason we have implemented a policy, where lost or damaged device are charged to employees, when carelessness or negligence is proven. As an additional detail, we charge full price, to allow a new device purchase.

The lack of clear governance policies and enforcement is the real problem with physical devices issued by the company. Back in the day, it was common to issue cell phone devices with dedicated lines for company use. It is common scenario for travelling associates and less common for office-based associates.

Has your organization thought about using VOIP service and part reimbursement for use of personal device to use? 
This would also require enterprise mobile VPN service enabled to route traffic for company web resources. 

In my experience, the cost/liability and operational overhead is far less going software based VOIP services like Zoom, Microsoft Teams, and few others in the marketplace than servicing the physical devices.

My previous organization implemented a strict one-strike policy for lost or damaged devices. While the first incident was considered an accident, repeat offenders were required to reimburse the company for the lost or damaged equipment. To mitigate potential risks, appropriate controls should be in place to remotely wipe devices if they are lost or stolen.