You can remove it, but it requires a SQL editor.
Go to data/data/com.android.providers.telephony/databases and edit nwk_info.db
Select the "carriers" table and locate the T-Mobile US LTE / 310260 entry (should be line 26)
Scroll all the way to the far right and change the editable value from 0 to 1.
Restart your phone and you should be able to edit the entry.
The other option is to edit /system/etc/apns-conf.xml directly.
Remember the first rule in tweaking your system... make a backup copy first.
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