CallLock is an Android app developed by AndUtil.

CallLock first became available on 02 Feb 2014. It is estimated that CallLock has been downloaded between 10000 and 50000 times from the Play Store.

CallLock 2.0 requires the following permissions:

Allows applications to access information about networks.

Allows applications to open network sockets.

Allows read only access to phone state, including the phone number of the device, current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.

Allows an app to create windows using the type TYPE_SYSTEM_ALERT, shown on top of all other apps. Very few apps should use this permission; these windows are intended for system-level interaction with the user.