How to implement a delay OPTOcoupler input there by the circuit remain on for the next 1 second
You may be able to get the circuit to stay on all the while the call is ringing by adding a capacitor as shown below. In this application the capacitor may have to be multiple uF in size. Select the capacitor to suit the cadence of the phone vibrator signal. 



If the capacitor gets too large then it may take more than one ring cycle before the capacitor charges sufficiently through the 470 ohm resistor to turn on the 2N2222.