No. The SimpliSafe alarm system doesn't require a Wi-Fi connection, cell phone, or computer. All you need are the base station and keypad. These components use a built-in cellular connection to communicate. But you may need to go online to activate and access certain features, including the SimpliCam security camera, which does require a Wi-Fi connection. You do need to pay for the Fast Protect plan to access cellular monitoring. Otherwise, the SimpliSafe system defaults to Wi-Fi.