If your SMS Relay setup includes mobile app-style alerts, A-Tech may provide a secure portal link that can be added to your phone home screen. On iPhone, this is usually done through Safari using Share and Add to Home Screen. On Android, Chrome may offer Install App or Add to Home Screen.
Only install alerts from the official A-Tech-provided link for your account. If you are unsure whether a link is correct, ask A-Tech through a support ticket before installing or signing in.