Disappointed with this product

Very disappointed with this product. Had it nearly 3 years. Works ok on WiFi but when I leave home and use data it’s very slow. Whoever calls at my home would be long gone when I received the notification.
Defeats the point of the product. Even on WiFi the time it takes to notify me is longer than if I was leaving my house . When I leave alarm goes on my phone immediately. Also on data the video playback can be very slow and jerky.