Is there such a thing call wireless router?

Basically I was wondering if there was a router or hotspot that you can carry with you, and with no service. And charge. So I can connect two devices and play local/co-op in games. Does this exist and is it possible? Also I got a hotspot with no service but I can't connect to it with my iphone. So I guess hotspot doesn't work?

Any wireless router should work. Simply leave the connection that normally goes to the Internet (ISP) disconnected.

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