Test:

Phone [A] Android 9 with telecommunication company [windtre].

Phone [B] Android 9 with telecommunication company [iliad].

GamePlay:

Phone [R] connected to router.

Phone [A]&[B] using mobile data internet.

All phones(NoLogin) running an very old version of MCPE(1.0.4).

With MCPE_v1.0.4 I had no problem with multiplayer.

Observed result:

Now(yesterday) Phone [A] can join [R]'s world, but Phone [B]  thaf  belongs to a different "company" receives the MSG(connect with WiFi to play with your friends).

How,,,an old MCPE version shows a new "msg" that belongs to new versions of MCPE.

NOTE:

It doesn't matter if this issue=>invalid,resolved,,ecc..

Just inform "The Team" for this test, maybe they are looking in the wrong direction.(No Offence)

Thank You.