I want to make a WiFi modem that can use a SIM card and has an Ethernet (LAN) output using Arduino modules. Please help me with the types of modules I should use and if there are any video tutorials or other resources that can assist me. Thank you!
Honestly, the most practical approach would be to take a mobile phone, connect it to a cell network and create a WiFi hotspot with it. Then use a separate WiFi router with an integrated ethernet switch to connect to this hotspot. This will make the connection available over ethernet. Select a WiFi router that has the capability of connecting to a WiFi hotspot.
There's no reasonable use case for anything Arduino-related in all this.
Draw a picture of all the devices involved and how you imagine the system to operate.
Or just buy a router that takes a SIM card.
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