I just activated a new 5S three days agao. I noticed that my data usage for these three days is significantly more than usual. From Internet searches, it seems settled that all things being equal, 4G LTE does not use more data than 3g.
So, could it be that when I activated the phone there was a large initial data usage when it pulled a lot of my information from my old phone/iTunes account?
So, could it be that when I activated the phone there was a large initial data usage when it pulled a lot of my information from my old phone/iTunes account?