Why won't my iPhone connect to my Wi-Fi? - 2

I have a linksys router. 3 wires are plugged into the back (in case any fell out I may have to find?) and 3 into the modem. The internet on my desktop computer works fine, however my phone and laptop won't connect even though it says it's connected. It just loads for a while until it says I have no connection. How can I fix this? Thanks.

Added (1). I realize that my router is the thing I need to fix but I don't know how? Lol

Iphones are known with their troubles with especially Wi-Fis…
But as your laptop is the same…
Maybe your router has a device limit you've exceeded?
Try disconnecting your desktop, restarting router and connecting with your iphone or laptop.

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