Yes, it is possible to add insurance to an existing AT&T Wireless plan. AT&T Wireless Insurance is designed to provide coverage for loss, theft, damage, or malfunction of mobile devices, which is especially useful for customers who want to protect their investments. To add insurance to an existing plan, customers typically need to enroll in the insurance program within a specified timeframe after acquiring their device. It is important to note that the availability and specific details about adding insurance may vary based on various factors, such as the type of device and the coverage options offered. Customers should review the current offerings on the AT&T website to find accurate information on coverage options, fees, and enrollment deadlines. Additionally, the website often includes guidance on how to proceed with adding insurance to an account, including any necessary steps or requirements.