Alfred Home Security Camera is a free and quick solution available for people looking to use and older Android smartphone as a surveillance camera. You can use a brand new phone as well, but this would be a complete waste in my opinion. Inside the intuitive interface you are required to complete the setup process in order to make things work.
Keep in mind that you will have to install this app on the device used as a camera also. During the setup process you can specify if you want to use the smartphone as a camera or as a viewer. A big advantage is the support for motion detection. Thanks to technologies like this one, you can configure your new surveillance camera to record footage only when movement is detected.
This is a great way to make sure you use the cloud storage space in a smart manner and not wasting it on useless videos. Inside the Settings window you are allowed to adjust the motion sensibility. In addition, the application will send you notifications each time movement is detected. Taking into consideration that Alfred Home Security Camera uses your Gmail account, you're also allowed to share this video feed with other people by selecting their Gmail accounts inside the interface.