OTO Free is an Android app developed by openvacs. Others apps created by openvacs are: OTO Global.

OTO Free first became available on 27 Dec 2011. It is estimated that OTO Free has been downloaded between 5000000 and 10000000 times from the Play Store.

OTO Free 2.6.1 requires the following permissions:

Allows applications to access information about networks.

Allows applications to access information about Wi-Fi networks.

Allows an application to initiate a phone call without going through the Dialer user interface for the user to confirm the call.

Allows an application to call any phone number, including emergency numbers, without going through the Dialer user interface for the user to confirm the call being placed.

Required to be able to access the camera device.

Allows applications to open network sockets.

Allows modification of the telephony state - power on, mmi, etc. Does not include placing calls.

Allows an application to read the user's contacts data.

Allows an application to read from external storage.

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.

Permission an application must hold in order to use ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS. This is a normal permission: an app requesting it will always be granted the permission, without the user needing to approve or see it.

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.

Allows access to the vibrator.

Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.

Allows an application to write the user's contacts data.

Allows an application to write to external storage.