What does network reset do?

According to If you see No Service, Searching, or SOS on your iPhone or iPad:

"Reset your Network Settings

Go to Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before."

If your iPhone or iPad won't connect to a Wi-Fi network may also be able to help you answer your question.

A detailed description of the iPhone’s “Reset Network Settings” function is available here:

Return iPhone settings to their defaults – Apple Support (AU)

Apriltx43 Said:

"What does network reset do?"

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Many things. For one, it allows you to troubleshoot Wi-Fi connectivity.