进入APP会使用通讯录功能存入本公司联系电话：门禁呼叫。
Enter the APP will use the address book function in the companys contact phone number:门禁呼叫.
当切换至后台时，仍然会保持视频通话，相比其他操作会消耗更多的电量。
When the switch to the background, will remain on video calls, operation will consume more power than others.
GPS在后台持续运行会影响电池续航时间。
Continued use of GPS running in the background can dramatically decrease battery life.