All my phone shows is to Join this network - Does not have a forget network choice

Hello Bean Bean

We see you're looking to 'forget' a Wi-Fi network, and we can certainly help out with that.

Details on how to do this process can be found here, for reference: How to forget a Wi-Fi network on your iPhone, iPad, iPod touch, or Mac

As the page will indicate, the option to 'forget' the network will only appear if you've both previously connected to the network in question, and also haven't already opted to 'forget' the network.

As found at the bottom of the page, "If you're using a supervised device that manages the connection to the Wi-Fi network, you might not have the option to forget that network."

Supervised devices are generally owned/provided by a school or business. Details on this here:

Get started with a supervised iPhone, iPad, or iPod touch

You may also try resetting network settings, if needed. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before. Be sure to note down any needed Wi-Fi passwords ahead of time.

Take care.

You can only forget networks you have previously joined. Other networks in the list appear there because they are nearby and cannot be deleted from that list. It's just showing you a list off all the networks it can see. Not of networks you are connected to or can forget.

The network list will include networks the phone can actually see. You can’t delete any networks in that list.

You can’t delete Wi-Fi networks.

MatthewZayas answer is correct. If you read the whole thread you will understand what was asked and what was answered.