I hope this helps. If you have any questions just ask :)
Here are some minecraFt pocket edition servers you guys can join.
Those are just a few but they go higher than sg100.lbsg.net
So you all have more than 100 servers to try out.!
The port is always 19132 by the way
Leave a like if it helped. Make sure to share Minecraft PE How to connect and register to a external server [0.12.1] to all your friends who need help. Even if they don't need help lol.