My Wi-Fi keeps disconnecting?

My old modem died. I installed a new one and now my Wi-Fi keeps disconnecting. It disconnects on my Iphone but works alright on my pc?

Added (1). It is a 70 dollar netgear modem

It depends what modem you have
How many devices you are connecting to it?
if you have a low speed modem you can't connect 2-3 devices
i have netgear N300 and we connect 10 devices to it or more sometimes
but it works perfectly that's why i bought a high speed modem.

$70 netgear is really ***.
I have used it before

http://www.officeworks.com.au/retail/products/Technology/Networking/Wireless-Modem-Routers/IN1533656;jsessionid=(J2EE7737600)ID1843265351DB00961699224313518172End;saplb. J2EE7737600)7737651

thats the perfect one.change your modem

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