A multitenant private communication system and a method for providing mobility and access control across tenant boundaries in the multitenant private communication system. The method includes receiving a first connection request from a user device for connection to first network infrastructure of a first tenant and establishing a connection between the user device and a first private sub-network of the first tenant through the first network infrastructure. The method further includes receiving a second connection request from the user device for connection to second network infrastructure of a second tenant of the multitenant private communication system and determining whether the second network infrastructure is a guest network infrastructure of the user device. The method also includes establishing a connection between the user device and the first private sub-network through the second network infrastructure when the second network infrastructure is the guest network infrastructure of the user device.