Why is my internet data usage high when not home?

Rsval wrote:

I am having the same issue. The device is at our lakehouse, no one is there. No devices are hooked up except for the nest thermostat... and I see multiple instances of data usage from 10mb to 224 during periods. Makes no sense but a good explanation would be welcome. 

I am new to Home Internet Light and I am also experiencing the same thing. I checked this morning and it showed almost 2GB of data usage at 4:30 in the morning. 

Since I have a fifteen day trial period, I am going to keep a close eye on the data consumption. A T-Mobile care representative is going to contact me next Sunday to see if things have changed.

There were several explanations given to me but I know technology and shot them down right away.

I used to have AT&T fixed wireless, which never used up data that quickly, even when watching full length movies.

Right now, I am annoyed with this usage issue. If AT&T provided a faster download speed, I would have never left them. In fact they allow 350GB for $60 per billing cycle.