A user device installs a third-party companion application with a primary software development kit (SDK) for cellular service activation on a wearable device, the wearable device including a third-party device application having an embedded SDK for the cellular service activation. The user device receives user input to initiate the cellular service activation for the wearable device and solicits, via the primary SDK, user input for account settings associated with the cellular service activation. The user device obtains, via the primary SDK and from a network device, activation parameters, associated with the wearable device, for the cellular service activation. The user device forwards, via the primary SDK and to the embedded SDK of the wearable device, the activation parameters, which the embedded SDK uses to request cellular activation.