Don't know much about iphones nor internet, but whenever my cousin comes over (Which is a lot unfortunately) the internet just drops. The download speed isn't effected that much but when I play Games such as csgo and overwatch the ping goes up to 2000. But when she isn't using her phone it instantly goes to 40-ish. I have a frontier router. I would ask her not to use her phone, but she acs like satan and I like my life. So is there away to stop this like maybe reduce the amount of wifi goes to her phone?