I'm going to make this as simple as possible, because I'm not a big tech person. I've had no service on my phone for about 6 months now and have just been using wifi, basically like a mini laptop in my hand. Is there any way I can get a system update without me having service? And how would I go about doing this? My phone is super slow and lagging and I'm thinking with an update it'll be faster. Any help would be greatly appreciated!