My phone has been extremely sluggish lately and the battery drains much more than it first did. I have tried uninstalling all apps but the essential apps, and it still acts this way. I have been thinking of performing a factory reset. I don't mind reloading all of my contacts since they are all synced but, will I have to "activate" my phone again? I've never done a factory reset when I am going to use the phone again, usually just when selling a phone.