Ok so the other day the weirdest thing happened to my internet, so i noticed that my internet speed was running ridiculously slow and like always i tried resetting the router which usually solves it, but it didn't. It turns out the problem was my moms iPhone, i know this because i tested this, i would run a speed test without her phone connected and i would get about 14down/1up and then i would run a speed test with it connected getting about.5down/.1up. My mom wasn't using any apps or anything that would use internet so something on my moms iphone was using the internet without us knowing and a lot of it. What could cause this to happen? Also as of the past couple days its starting to act normal again even with her phone connected. Our Wi-Fi is only hooked up to my iPhone, my sisters laptop and my moms iPhone. I even tried restoring the phone and although it didn't even have any apps installed or no browser open it would still use internet! And yes we have a password for the Wi-Fi. Please give me a good explantation for this, this has never happened to me before. I also noticed that when my moms phone wasn't connected the light on our modem would barely flash at all but as soon as i connected it the light would flash contstantly.