Apps using QCI2 in LTE

Hi Experts,
Can anyone name a few apps which use QCI2 in LTE?
Which QCI is being used in Video Calls in Whatsapp, IMO, etc.?
Is it QCI2?

All OTTs use QCI 6, 7, 8 or 9.

So is QCI 2 used anywhere?

QCI2 is a GBR don’t know if any operator use it.
As far as I know QCI1 and QCI5 are only GBR in use.

It is used for ViLTE (Video over LTE).

Yes, correct, but is it implemented anywhere?

Operators implementing ViLTE use either QCI2 or QCI7 for the IMS-based video call