What WIC cards can not be installed on a Cisco 2900 series router?

The Cisco 2900 series routers do not support the installation of the WIC-1T (WAN Interface Card) and WIC-2T cards, as these are designed for older router models. Additionally, certain high-capacity or more advanced WIC cards, such as those designed for specific services or technologies not supported by the 2900 series, cannot be installed. Always refer to Cisco's official documentation for a detailed list of compatible interface cards for the 2900 series.