The iPhone welcome screen, which displays only the first time the app is launched, was inadvertently exposed to Pro customers. Enterprise publishers can use it to provide information about restoring purchases and so forth, but it requires the use of custom APIs to set up links. You can read more about the option here:
Ah, now this makes sense.
Do we have to use the Ipad Companion guide also for Iphone Apple certs and Submission ?
Is it the exactly same process (not for the content of course)
Yes, it's the same process for the ipad and iphone, although the current version of the companion guide PDF is still for v20. I plan to update it soon.