Android平台提供的电话信息系统管理功能，主要包括：获取电话信息（设备信息、SIM信息以及网络信息）、侦听电话状态（呼叫状态、服务状态、信号强度状态等）和调用电话拨号器。
TelephoneManager类在Manifest中添加Permission ：<uses-permission android:name="android.permission.READ_PHONE_STATE" />
TelephonyManager的获得：TelephonyManager tm = (TelephonyManager) this.getSystemService(TELEPHONY_SERVICE);
Constants
String ACTION_PHONE_STATE_CHANGED Broadcast intent action indicating that the call state (cellular) on the device has changed. int CALL_STATE_IDLE Device call state: No activity. 空闲（无呼入或已挂机） int CALL_STATE_OFFHOOK Device call state: Off-hook. 摘机（有呼入） int CALL_STATE_RINGING Device call state: Ringing. 响铃（接听中） int DATA_ACTIVITY_DORMANT Data connection is active, but physical link is down 电话数据活动状态类型：睡眠模式（3.1版本） int DATA_ACTIVITY_IN Data connection activity: Currently receiving IP PPP traffic. 电话数据活动状态类型：数据流入 int DATA_ACTIVITY_INOUT Data connection activity: Currently both sending and receiving IP PPP traffic. 电话数据活动状态类型：数据交互 int DATA_ACTIVITY_NONE Data connection activity: No traffic. 电话数据活动状态类型：无数据流动 int DATA_ACTIVITY_OUT Data connection activity: Currently sending IP PPP traffic. 电话数据活动状态类型：数据流出 int DATA_CONNECTED Data connection state: Connected. 数据连接状态类型：已连接 int DATA_CONNECTING Data connection state: Currently setting up a data connection. 数据连接状态类型：正在连接 int DATA_DISCONNECTED Data connection state: Disconnected. 数据连接状态类型：断开 int DATA_SUSPENDED Data connection state: Suspended. 数据连接状态类型：已暂停 String EXTRA_INCOMING_NUMBER The lookup key used with the ACTION_PHONE_STATE_CHANGED broadcast for a String containing the incoming phone number. String EXTRA_STATE The lookup key used with the ACTION_PHONE_STATE_CHANGED broadcast for a String containing the new call state. int NETWORK_TYPE_1xRTT Current network is 1xRTT int NETWORK_TYPE_CDMA Current network is CDMA: Either IS95A or IS95B int NETWORK_TYPE_EDGE Current network is EDGE int NETWORK_TYPE_EHRPD Current network is eHRPD int NETWORK_TYPE_EVDO_0 Current network is EVDO revision 0 int NETWORK_TYPE_EVDO_A Current network is EVDO revision A int NETWORK_TYPE_EVDO_B Current network is EVDO revision B int NETWORK_TYPE_GPRS Current network is GPRS int NETWORK_TYPE_HSDPA Current network is HSDPA int NETWORK_TYPE_HSPA Current network is HSPA int NETWORK_TYPE_HSPAP Current network is HSPA+ int NETWORK_TYPE_HSUPA Current network is HSUPA int NETWORK_TYPE_IDEN Current network is iDen int NETWORK_TYPE_LTE Current network is LTE int NETWORK_TYPE_UMTS Current network is UMTS int NETWORK_TYPE_UNKNOWN Network type is unknown int PHONE_TYPE_CDMA Phone radio is CDMA. int PHONE_TYPE_GSM Phone radio is GSM. int PHONE_TYPE_NONE No phone radio. int PHONE_TYPE_SIP Phone is via SIP. int SIM_STATE_ABSENT SIM card state: no SIM card is available in the device int SIM_STATE_NETWORK_LOCKED SIM card state: Locked: requries a network PIN to unlock int SIM_STATE_PIN_REQUIRED SIM card state: Locked: requires the user's SIM PIN to unlock int SIM_STATE_PUK_REQUIRED SIM card state: Locked: requires the user's SIM PUK to unlock int SIM_STATE_READY SIM card state: Ready int SIM_STATE_UNKNOWN SIM card state: Unknown.
public static final String EXTRA_STATE_IDLE Value used with EXTRA_STATE corresponding to CALL_STATE_IDLE. public static final String EXTRA_STATE_OFFHOOK Value used with EXTRA_STATE corresponding to CALL_STATE_OFFHOOK. public static final String EXTRA_STATE_RINGING Value used with EXTRA_STATE corresponding to CALL_STATE_RINGING.
int getCallState() Returns a constant indicating the call state (cellular) on the device. CellLocation getCellLocation() Returns the current location of the device. int getDataActivity() Returns a constant indicating the type of activity on a data connection (cellular). 处理侦测到的数据活动的改变事件。通过该函数，可以获取数据活动状态信息。 电话数据活动状态类型定义在TelephoneyManager类中。