Cellular data not being tracked

[radarridge]

I last reset the data usage stats on my iPhone 6 on 2/16/17. A few days ago the data count was at 3.7GB. Now the phone is showing 0 bytes of cellular data used. The last reset date is still displayed as 2/16/17. Help!

I've been unable to update to iOS 10.2.1, if that's relevant.

 

[Just_Me_D]

Why have you been unable to update to the latest official iOS version for your device?