Why won't my iPhone connect to my home network?

It's connected before today but my mom had people come in and fix it because when she would connect to it, the router messes up and no one was able to use the internet. Now I can use my desktop at the same time she uses her wireless connected laptop. But my iPhone won't join the network and neither will my other laptop.

You turn off mobile network, and turn on Wi-Fi settings in settings, if no, may be your ROM has problem, update it

If someone tampered with or replaced your Wi-Fi router, you likely need to set the new matching wireless security settings on your laptop and iPhone.

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