Use old smart phone as home security camera

Use old smart phone as home security camera WiFi or 4g connection needed , power Bank, 

.. donot use Google account old phone factory reset it from Google play alfrad camera app install register it while set up I use this device as question camera option select it now with Google account login after account login smart phone security camera live streaming get it started other phone app download it set up it use this device as question viewer option select it on it Google account login now you can see old phone camera live feed watch it apps use subscription needed using app that site go-to using Google account sign up it.