You wouldn't get speeds any faster than you would with, say, fiber optics, since you still have to send classical information down a classical channel in addition to the quantum information that gets sent by entanglement.

I don't have fiber optics to my cellphone.

Quantum entaglement isn't very useful for networking.

Why not?

I'm legitimately curious, but I'm obviously not Googling the right things.

Because the states are still random, despite being correlated. Read up on it in wikipedia for detail.

But with checksums, it's still possible to get reliable data out of it. The question is how fast, and when that's faster than the other possibilities.

Could it be faster/more reliable than cellphones? Or inter-planet communication?

too bad the ansible of "Ender's Game" is fiction
or is it?

Ah. Sad.

Wikipedia to my rescue. (the parts I could read at least)

No, not checksummable. Random. The correlation is that if you know what one end's state ended up as, you know what the other end's state is. But you can't pick the state. So it's a pair of geographically separated random sources with high correlation.