PRL Update?

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http://forums.androidcentral.com – OK, I'm not a phone "newb" but I'm scratching my head over this issue. (I've been on Sprint the past 4 years, just got on T-Mobile) I can't figure out how to manually update my PRL (preferred roaming list) on my HTC One. (again, T-Mobile edition) What am I missing? On my previous HTC phones on Sprint, it was there in Settings under software update. On THIS phone, it's a simple "ID10T button" of 'check for updates'. I've even looked over in Developer options. I did discover they took away my option to keep the screen ON when plugged in, which is something of a pai (HowTos)