Hello, i have iPhone 6 (16gb) running iOS 10.3.1. Facing some performance issues and also a few other issues like step count is not accurate. I am planning to erase all contents and settings and setup my iPhone from scratch again. Need advise on- 1) Does factory resetting the iPhone help improve performance? 2) If i use the same apple id again after factory resetting, will it restore all my synced things or does it ask what to be synced? I would like to get the contacts back again and OK to reinstall the apps and do all the settings myself again.