Changing a mobile device feature set upon detecting attachment of a case

A mobile device, comprising:

• a magnetic sensor configured to output a signal indicative that a case is attached to the mobile device;
• an internal antenna;
• a connector configured to connect to an external antenna on the case;
• a radio circuit;
• a logic device;
• and
• a storage device comprising instructions operable by the logic device to
• implement a first feature set on the mobile device, the first feature set comprising at least a first RF antenna setting where the radio circuit uses the internal antenna,
• detect that the case is attached to the mobile device and also an identity of the case using the magnetic sensor, and
• change from the first feature set to a second feature set in response to detecting that the case is attached, the second feature set comprising a second RF antenna setting where the radio circuit uses the external antenna.

A mobile device, comprising:

• a magnetic sensor configured to output a signal indicative that a case is attached to the mobile device;
• a logic device;
• and
• a storage device comprising instructions operable by the logic device to
• implement a first feature set on the mobile device,
• detect that the case is attached to the mobile device and detect an identity of case using the magnetic sensor, and
• change from the first feature set comprising a first RF setting to a second feature set comprising a second RF setting in response to detecting that the case is attached, the second feature set selected based upon the identity of the case.