How do I get my apartment/isp (telcom) to let me open a port on my router
I reside in an apartment complex where the internet services are not controlled by the management, but instead, they are managed by our ISP, Telcom. Unfortunately, Telcom restricts certain functionalities for users, such as not helping with the opening of ports or providing the admin username/password for my router. Additionally, my router doesn't appear on the network tab of file explorer. Given this situation, what options do I have to address these limitations to port forward?
The router doesn't have file shares, so it doesn't show up on file manager. You most likely need to connect to that with a browser by IP-address. But as port forwarding can have severe security issues I really suggest that you learn more on what you're trying to do and understand the implications before poking holes to your firewall.
I'm not comfortable to provide step-by-step instructions since doing that wrong can cause all kinds of havoc on your network (and the whole apartment if you happen to have IoT-things around).
The fact that you said "my router doesn't appear on file explorer" tells us everything we need to know about your skill level. You don't know the first thing about "protecting this open port" and you aren't qualified to assess the security risks of what you are trying to do.
i would expect your lengthy research would have included "router model default password", "reset password router model" and "port forward on router model"
Ok, this should be pretty easy then. Just set up an instance in a cloud service provider (Oracle has lots of free stuff for this) and set up wireguard. Establish a VPN connection to your cloud server and port forward from there.
If you do know how to protect that open port then this should be pretty straightforward.
One solution would be sending email requesting for them to open ports for you, you can tell them that you need open ports for security cameras and use that port for reverse proxy. That way you dont need more than one open port.
Second option is cloudflare tunnels, they do not require open ports at all, but they do require for you to buy domain though.
Last option would be to use VPN like tailscale which also do not require open ports at all. All you need is clients installed on devices and connect them on the same network.
Hope some of these help, i actually use all methods for different situations and each of them have pros and cons, but those are all reliable methods.