Intelligent communication line selection supporting rich context of input factors

A mobile device comprising:

• one or more processors;
• and
• memory coupled to the one or more processors, wherein the memory stores computer-executable instructions causing the mobile device to perform a method comprising:
• selecting between a subscriber identity module (SIM) line and a non-subscriber identity module (SIM) line as a default line;
• displaying a user interface depicting a plurality of contact points for a contact and an activatable user interface element activatable to initiate communications with a particular contact point for the contact;
• receiving an activation of the user interface element;
• responsive to activation of the user interface element, initiating communications with the particular contact point via the selected default line;
• and
• for another of the contact points of the contact, presenting a different subscriber identity module (SIM) line or a non-subscriber identity module (SIM) line as a default line.

One or more computer-readable storage media comprising computer-executable instructions causing a computing system to perform a method of selecting a default communication line for a contact point associated with a contact, the method comprising:

• receiving a plurality of input factors comprising a source of the contact point;
• selecting a default communication line for the contact point based on the source of the contact point, wherein the selecting further supports factors comprising a communication line with which the contact point is registered, a communication line from which the contact point was imported, and a communication line most recently involved in communications activity with the contact point;
• and
• subsequently overriding the default communication line selected for the contact point, wherein the overriding supports factors comprising explicit selection received from a user interface and signal strength.