Help Tablet useless?

[Tablet Question]

My tablet keeps on using up data even though it's been connected to the wifi, is it just completely useless to have now, since it's been more than 2 weeks since I've had it?

 

[iowabowtech]

Is your network connection altogether? That's the only way you could really be sure. If not, wifi could drop unbeknownst to you and your network connection could take over, hence some data usage.