Telecom's version includes non-cellular calls in its result. Many apps compile against TelephonyManager's existing API so we should update it to use telecom instead. We kept the implementation as cellular-only for getCallState[ForSubscription](...) version of the API (which is hidden anyway). Bug: 21732997 Change-Id: Ifd27e6b49d76fe96ccc969e5262b1a876670aeef