Communication with your partner and other Asylums is relatively easy, regardless the distanxe. Communication with more than one also in a specific radius is not a difficult task. 

Lost Numbers and Unlinked are not connected to the code. 

All Asylums are linked to their partners, and the link between them is connected to other Asylums forming a large synapse known as the code. Chronos are able to tap directly into the code. However all this is classified.