If an app is intended to make video calls is the u phones face time iOS necessary in order for the app to work on iPhone
App beeing used is the GTL via path video calls WICH IS linked to gtl getting out messaging ..
Hi, welcome to Apple Support Community!
If I am understanding your question correctly, no, the FaceTime app is not required to be on your phone in order for other messaging apps to work.
Hope this helps, have a great day and a happy new year!