I decided to play with my friend and Then Created a World and making sure that multiplayer was on and it was but when I entered the world it said Multiplayer was off this only happens when you play on Mobile Data on Wi-Fi there is no problem
So, Please Mojang Studios Fix this bug
Thank you for your report!
We're tracking this issue in MCPE-43127, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki