Trying to get T-Mobile USA LTE on C6903

[Chump]

Hello all!
I've been trying to get T-Mobile's LTE working on my Z1 but my attempt have all failed. My device is running unrooted and unflashed if it helps.
All I've gotten to connect to is 4G at the moment. I live in NYC so I'm well assured there's LTE in my area.
Any help is appreciated!

[Uliwooly]

try this

settings > more > mobile networks > apn > menu > add New > enter this

Name: T-Mobile

APN: epc.tmobile.com or fast.tmobile.com (for LTE devices)

Proxy:

Port:

Username:

Password:

Server:

MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc

MMS proxy:

MMS port:

MMS protocol: WAP 2.0

MCC: 310

MNC: 260

Authentication type:

menu > save

restart your phone

C6903

800 / 850 / 900 / 1700 / 1800 / 1900 / 2100 / 2600

C6906

700 / 850 / 900/ 1700 / 1900 / 2100 / 2600 

C6943

LTE 800 / 850 / 900/ 1700 / 1800 / 1900 / 2100 / 2600

USA Carrier Voice Frequencies 3G 4G 3G Technology 4G Technology

AT&T	850 MHz, 1900 MHz	850 MHz, 1900 MHz	700 MHz, 1700/2100 MHz	GSM/HSPA+	LTE
MetroPCS	1700/2100 MHz, 1900 MHz	1700/2100 MHz, 1900 MHz	1700/2100 MHz	CDMA/EVDO	LTE
Sprint	800 MHz, 1900 MHz	1900 MHz	800 MHz, 1900 MHz, 2500 MHz	CDMA/EVDO	WiMAX (2010–present) LTE (2012–present)
T-Mobile USA	1700/2100 MHz, 1900 MHz	1700/2100 MHz, 1900 MHz	1700/2100 MHz	GSM/HSPA+	LTE (2013)
Verizon	850 MHz, 1900 MHz	850 MHz, 1900 MHz	700 MHz, 1700/2100 MHz (Planned)	CDMA/EVDO	LTE [3][4]
U.S. Cellular	800 MHz, 1900 MHz

[Chump]

Might sound silly but I can't seem to find MMS Protocol anywhere in the menu.

[Uliwooly]

Don't worry about that protocol

Name : T-Mobile LTE

APN: fast.tmobile.com

MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc

MCC: 310

MNC: 260

APN Type: default,supl,admin,dun,mms

[Chump]

Still no luck. I've double checked the settings and restarted my phone twice but 4G is still what I'm connecting to.

[Uliwooly]

I have AT&T and for it to work the first time, I had to have an AT&T branded 4G device so they can enable 4G LTE on my account, I wonder if that's the case with your phone, also how old is your SIM card, stop by a Tmobile store and get a brand new SIM card, they are free. 

[Chump]

I'm actually thinking it's my sim card, it's about two years old at least. I'll head over and get it.

[Chump]

New sim card didn't do the trick. I haven't had a T-Mobile branded device in a while so maybe that's the problem?

[Uliwooly]

I think so, contact them and ask them if 4G LTE its available in your area and if it is if its available in your account

[Chump]

Spoke with T-Mobile and Sony, the latter of which just told me to call T-Mobile, and was told it's the device that doesn't support T-Mobile's LTE since the option for LTE doesn't show up as a choice in Network mode.