What does 250MB at 4G Speeds mean using Simple Mobile?

I plan on activating my iPhone with Simple Mobile. Their data plan say Unlimited. I would like to know what does 250MB at 4G Speed mean? I don't get it. Please explain.

I suggest you activate on NET10. They use the ATT network and you do not have to unlock the phone.
The data is 3g or 4g depending on which Iphone you will use.
Hope this helps

PS Simple Mobile is extremely slow because the data protocol is different than what the phone has in it.

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