Which of the following is NOT a removable storage device typically found in smartphones?

The choice of a microchip as not being a removable storage device in smartphones is accurate because microchips, such as those used for processing or controlling functions within the device, are generally integrated into the smartphone's hardware. They are not designed to be removed or replaced by users and are essential components that allow the device to function.

In contrast, a SIM card is used for network connectivity and can be removed to switch carriers or devices. An SD card provides additional storage capacity and is also removable, allowing users to transfer data or expand their device storage. Internal memory, however, refers to the built-in storage that is not intended for user removal, making it similar to microchips in the sense that it is typically not replaceable.

Thus, the distinction lies in the purpose and design of these components; microchips are fundamental to the device's operation and are permanently affixed, while SIM and SD cards are designed for user management and modification.