Buy the phone from T-Mobile, unlock it via on of the reliable online unlocking services, unlock the phone. If you have an existing AT&T account with LTE, its easy as slipping in the sim. If not, its a little trickier, AT&T will generally restrict non-AT&T phones to 3G/4G --> No LTE. If you are activating a new account, you will need to provide them an IMEI from an AT&T branded phone with LTE, they will then provision your account for LTE service. Some people use a fiends old AT&T LTE phone, or from another source.
seattleboi1982
Senior Member
Actually, it shows up as a SM-G900T and i do get LTE after i gave them my IMEI. you do, however, have to manually enter in the APN settings:
Name: ATT Phone
APN: phone
Proxy: not set
Port: Not set
Username: not set
Password: notset
server: not set
MMSC: http://mmsc.mobile.att.net
Multimedia message proxy: proxy.mobile.att.net
Multimedia message port: 80
MCC: 310
MNC: 420
Authentication typw: None
APN type: default, supl, mms,hpri,fota
APN protocol: IPv4
APN Roaming Protocol: IPv4
Bearer: Unspecified
Mobile vrtual network operator: not set
Last edited:
I have a TMOBILE S5 - I didnt' want to wait for the "Free way" of unlocking a sim card so I purchased the code form a web site that offers this - there may be a free way to do this sometime soon - but I didn;t have the patience to wait - do a GOOGLE SEARCH - you'll find several that offer this service.
I have no restrictions on my phone - 3G/4G/LTE - awesome speeds on ATT LTE network - =
If you have an existing AT&T account, its easy. The trickier part is if you are a new customer, the T-Mobile S5 IMEI wont be registered in their database as an LTE device, so it will default to non-LTE speeds.
Some people have had success with really helpful non-corporate AT&T stores at adding the non AT&T branded phone into the database, but most won't and so you need to get creative. You'd probably have better luck convincing an independent dealer to do this, like a mall kiosk etc. as they will want the commission from the activation. Some people have had luck using the IMEI from a demo phone at the store (Can be from any LTE device), or a friends old device etc.
The key is that it needs to be an AT&T branded LTE phone so your account can be correctly provisioned with LTE, otherwise you will be stuck in 4G land. Another way you can do it is also to call in later and switch the IMEI to an AT&T LTE device, get the account provisioned and then put the sim in the T-Mobile S5.
Some people have had success with really helpful non-corporate AT&T stores at adding the non AT&T branded phone into the database, but most won't and so you need to get creative. You'd probably have better luck convincing an independent dealer to do this, like a mall kiosk etc. as they will want the commission from the activation. Some people have had luck using the IMEI from a demo phone at the store (Can be from any LTE device), or a friends old device etc.
The key is that it needs to be an AT&T branded LTE phone so your account can be correctly provisioned with LTE, otherwise you will be stuck in 4G land. Another way you can do it is also to call in later and switch the IMEI to an AT&T LTE device, get the account provisioned and then put the sim in the T-Mobile S5.
seattleboi1982
Senior Member
That's not true, it does register as an LTE device. i gave them my IMEI off the T-mobile Galaxy S5 and they added it to the biller, and then asked them what does it show up as in the biller, they read it off as a Samsung SM-G900T. not a Samsung SM-G900A. Heck, even my Nexus 5 shows up as it should as a LG D820, which is the model.
Well just to let everyone know. I bought an unlock code from unlockfusion and 48 hours later it still hasn't arrived but I bought one from cellunlocker.net and my phone is now unlocked
Sent from my SM-G900T using XDA Premium 4 mobile app
Sent from my SM-G900T using XDA Premium 4 mobile app
Yes, if they add your IMEI into their system, you are fine. Many stores and CSR's will not do this however, in which case you need to figure out a workaround. Stores are paid a higher commission for selling and activating a branded phone that they are for an unlocked off network device.
seattleboi1982
Senior Member
and I'm kinda surprised, BYOD is a very big thing right now. possibly just some shady reps or stores, CSR's should be able to do it with no issues.
T-Mobile S5
For this that are using the T-Mobile S5 on AT&T. Sounds like LTE and everything is working well. My question is, for this who have rooted and using different roms. Have you seen the lag go away? Is the phone a better experience. I love my M8 but I just love the thinner feel of the S5 but I cannot live without root and roms. Please help before I drop $650. LOL
For this that are using the T-Mobile S5 on AT&T. Sounds like LTE and everything is working well. My question is, for this who have rooted and using different roms. Have you seen the lag go away? Is the phone a better experience. I love my M8 but I just love the thinner feel of the S5 but I cannot live without root and roms. Please help before I drop $650. LOL
There is virtually no difference from my old SM-G900A to my new SM-G900T. I'm using a custom ROM (see signature) with zero reception issues. My LTE is 24Mbps down and 11Mbps up. That's out in the boonies where I work, it's usually better at home.
I pulled 25mbps down and 14mbps up in Knoxville TN. If you are in a weak signal area it does seem to drop signal a little more frequently.
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Actually, it shows up as a SM-G900T and i do get LTE after i gave them my IMEI. you do, however, have to manually enter in the APN settings:
Name: ATT Phone
APN: phone
Proxy: not set
Port: Not set
Username: not set
Password: notset
server: not set
MMSC: http://mmsc.mobile.att.net
Multimedia message proxy: proxy.mobile.att.net
Multimedia message port: 80
MCC: 310
MNC: 420
Authentication typw: None
APN type: default, supl, mms,hpri,fota
APN protocol: IPv4
APN Roaming Protocol: IPv4
Bearer: Unspecified
Mobile vrtual network operator: not set1You don't need T-Mobile service to get the at&t unlock. For my T-Mobile note 3 I unlocked it for at&t with chainfire s app called region away. When I did it it didn't support KitKat but that was a few months ago. I'm sure its updated by now. There is a thread on here on how to do it.
Sent from my GT-N7105 using XDA Free mobile app
---------- Post added at 12:32 PM ---------- Previous post was at 12:30 PM ----------
I have also used the cellunlocker.net and it works like a charm for about 25to 30 bucks I think it was.
Sent from my GT-N7105 using XDA Free mobile app1
Like I said, it works outright without the need to flash anything.
I am on AT&T with TMo based ROM. I used it on AT&T without evening rooting for a few days.
And if you want to flash, you could flash just about anything, as long as the ROM OP states that it supports the model (900T in this case).
Also, if a person's post helps you, you could simply hit the thanks button
1
People like me, who travel across countries, having many bands is actually more helpful, along with the ability to switch between types of data networks.
Sent from my SM-G900T using XDA Premium 4 mobile app1
Shouldn't matter. I unlocked mine with no issues.
I used cell unlocker
All I mentioned was that it was Samsung Galaxy S5, and that it needs to be unlocked.
Go to this link to go direct unlocking page.
Under carrier select "all US networks".
