LTE APN for T-Mobile iPhone?

I have an iPhone 5 with T-Mobile and I'm wondering what the APN is under LTE Setup. It says it is optional but I would like to have it.

Input the fast.t-mobile.com in the LTE setup APN anyways says is optional nothing different with the speed. So you can leave in blank.

Since T-Mobile doesn't have LTE support yet, does it matter?
WHEN T-Mobile has LTE enabled, you should get the APN.

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