• Welcome to the all-new iMore Forums! - We're still moving some things around, so you may see a few quirks here and there, but we're working on getting things fully completed as soon as possible. For now, take a look around, and if you run into any major issues, please let us know in this thread!

System services....anything important in there I should leave on?


New member
Jun 26, 2011
Cell network search: helps to narrow down what cell networks to look for based on where your phone is
Compass calibration: north and "magnetic north" deviate a different amount depending on where you are.
Diagnostics & Usage: so. Apple knows where you when crash reports are sent in
Location based iAds: seems obvious
Setting time zone: seems obvious
Traffic: again, seems obvious. Although not sure how this data is used at apple


New member
Nov 3, 2011
I believe traffic is used to update the live traffic view on Google Maps. I'm guessing it takes into account your current speed while driving and uses the data to update the maps.