on 18-03-2019 09:55
@jozzerkaren no one here could know if it was normal for you as everyone has different usage.
You can look in your phone settings to see which apps are using the most data and then you can choose to restrict their access to mobile data if you wish.
Some common apps that use a lot of data are the social media ones such as Facebook, Twitter, Instagram etc. They all have the option to restrict the playing of videos when on mobile data so check if they are set to always play, which will very quickly use up 100mb.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)
on 18-03-2019 12:46
T this happens all too often, more so with iPhones and the best way of checking is by using the phones data stays. I remember @MI5 had to change network bevan of this phenomenon with the O2's system of recording usage If you can't see any issue with a rogue app then set your phone data setting to zero so you can compare data usage to that stated in My O2.