I'm using cellular data on my phone to play multiplayer. when I connect with my friend's world it says "unable to connect world." I test it out entering big servers and I was able to enter smoothly, having no problem at all. However, I can't seem to enter or connect with my friend's world.
it keeps displaying as, "unable to connect world."

My other friend uses iOS with cellular data and she was able to enter with her friend's world smoothly, and when she tried to enter mines, her screen shows "unable to connect world".