... i got my phantom 4 repaired in dallas ... the techs told me not to use the "DJI Go 4 app for my Phantom 4; to use the DJI Go app instead.

... but when i open the DJI Go app, there is no Phantom product available to choose in the equipment section.

... how do i get my Phantom into the air?

DJi Go 4 app is perfectly fine for the P4

the techs told me not to use the "DJI Go 4 app for my Phantom 4
You've been given bad advice.
They must have confused it with the Phantom 3 series.
The appropriate app for the P4 is DJI Go 4.

Hello there Bilbobrud. I am sorry for the trouble this has caused and thank you for reaching out. Kindly please download the DJI Go 4 application on your mobile device. The DJI Go 4 application is compatible with the DJI Mavic Series, DJI Spark, DJI Phantom 4 drones. Thank you.

https://www.dji.com/downloads/djiapp/dji-go-4