RE : question.
Do you have to re calibrate the drone to the phone.
Do you have to turn the drone of and back on to pair with the phone
I know I have to turn the controller of to pair the wifi
Answer : NO to all 3. Particularly "no" to the last question. Your controller has nothing to do with pairing the phone with the drone's camera.
RE : for the life of me I couldn't get my phone the pair with the drone.
SG903Pro is a 5g wifi drone.
You need a phone that also has 5g wifi (802.11ac wifi) in order to connect the drone's camera with the phone.
Please read the other thread listed below, post #6 regarding 5g wifi. It is applicable to all 5g wifi toy drones.