MultiPlayer on Android?

MultiPlayer on Android is possible to make for free,without buying pun+ or unity pro?
id’like create co-op fps game for mobile.
This is possible?

You don’t need Unity Android Pro or anything alike.
But without them, you are required to use Unity Networking for multiplayer (or WWW), because the .NET UDP / TCP sockets are not present (they require Unity Pro + Android Pro).

I guess PUN+ bypasses that through implementing the networking on native code outside of Mono and the .NET limitations, but you could actually do the same if you wanted, integrating PUNs other SDKS (android etc) into your application yourself.