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Hey Guys,
I have a Motorola RAZR HD XT925 which was sourced from Rogers Canada. I was wondering how I can check the devices LTE frequencies? Is there any engineering code and/or menu that would assist with this? This device apparently supports LTE 800 / 1800 / 2600 or LTE 700 / 800 / 1700 / 1800 / 2600 according to GSM Arena. I am wanting to use the LTE 1800MHz frequency in Australia, though cannot get it to connect.
I have tried the following:
Searching for networks manually / letting the device select them automatically
Toggling between 3G only and Automatic (4G/3G/2G)
I definitely have the correct APN settings configured (for Telstra in Australia)
Data is enabled, the SIM card connects to 4G in another mobile
Any assistance would be appreciated, in finding out which LTE network frequencies this device supports.
MarrkDaviid said:
Hey Guys,
I have a Motorola RAZR HD XT925 which was sourced from Rogers Canada. I was wondering how I can check the devices LTE frequencies? Is there any engineering code and/or menu that would assist with this? This device apparently supports LTE 800 / 1800 / 2600 or LTE 700 / 800 / 1700 / 1800 / 2600 according to GSM Arena. I am wanting to use the LTE 1800MHz frequency in Australia, though cannot get it to connect.
I have tried the following:
Searching for networks manually / letting the device select them automatically
Toggling between 3G only and Automatic (4G/3G/2G)
I definitely have the correct APN settings configured (for Telstra in Australia)
Data is enabled, the SIM card connects to 4G in another mobile
Any assistance would be appreciated, in finding out which LTE network frequencies this device supports.
Click to expand...
Click to collapse
Do not rely on GSM Arena those guys are rookies.
The Rogers RAZR HD has LTE 700/1700/2100 via the rogers website.
MarrkDaviid said:
Hey Guys,
I have a Motorola RAZR HD XT925 which was sourced from Rogers Canada. I was wondering how I can check the devices LTE frequencies? Is there any engineering code and/or menu that would assist with this? This device apparently supports LTE 800 / 1800 / 2600 or LTE 700 / 800 / 1700 / 1800 / 2600 according to GSM Arena. I am wanting to use the LTE 1800MHz frequency in Australia, though cannot get it to connect.
I have tried the following:
Searching for networks manually / letting the device select them automatically
Toggling between 3G only and Automatic (4G/3G/2G)
I definitely have the correct APN settings configured (for Telstra in Australia)
Data is enabled, the SIM card connects to 4G in another mobile
Any assistance would be appreciated, in finding out which LTE network frequencies this device supports.
Click to expand...
Click to collapse
XT925: (international)
Secondary Cellular Networks: LTE700 (B17), LTE1700/2100 (B4), LTE1800 (B3), LTE2600 (B7), LTE800 (B20)
From what I've read, B3 is Australia's LTE band, so it is supported, but it might be turned off in roger's radio.
Have you tried installing the firmware for Telstra? It's available here: http://sbf.droid-developers.org/van...25_A045_WIG149790_Service1FF_fastboot.xml.zip from this thread: http://forum.xda-developers.com/showthread.php?t=1943879 Maybe switching to your provider's firmware will fix the LTE issue.
Hi
Can you please provide an update. Did you manage to flash the Testra fw and latch in to the LTE 1800 band?
Coz i would like to buy a phone and do the same thing as you. I would not buy if you did not suceed.
MarrkDaviid said:
Hey Guys,
I have a Motorola RAZR HD XT925 which was sourced from Rogers Canada. I was wondering how I can check the devices LTE frequencies? Is there any engineering code and/or menu that would assist with this? This device apparently supports LTE 800 / 1800 / 2600 or LTE 700 / 800 / 1700 / 1800 / 2600 according to GSM Arena. I am wanting to use the LTE 1800MHz frequency in Australia, though cannot get it to connect.
I have tried the following:
Searching for networks manually / letting the device select them automatically
Toggling between 3G only and Automatic (4G/3G/2G)
I definitely have the correct APN settings configured (for Telstra in Australia)
Data is enabled, the SIM card connects to 4G in another mobile
Any assistance would be appreciated, in finding out which LTE network frequencies this device supports.
Click to expand...
Click to collapse
Hi. This is a good source here in Australia. Hopefully is updated and current. http://whirlpool.net.au/wiki/mobile_phone_frequencies
Note, however, that LTE is really new here and not yet well implemented. I live in Sydney, but I'm outside of the LTE network at home. I'd have to travel closer to the business district to get it. I think its implemented around the airport as well. LTE is still a work in progress and Telstra is ahead of the game with the other telcos, but you're going to want to be able to connect to their "Next G" or 3.5 G to fallback on otherwise youre going to get 2G.
In any case, you want to make sure your APN settings are correct as well. There is loads of misinformation about that. You can have Telstra set them for you (or at least it worked on my Galaxy S2, haven't tried with this phone since I got it from their store). Try this link and see if it the correct one: http://www.configure.telstra.com.au/telstra/index.jsp
On my Galaxy S2, I had read lots of documentation and had things working but found that after going through a Telstra automated thing (I think the above link), that it set my APNs for me and I ended up with better speed and signal.
Just found this from their site as well concerning their 4G and 3G frequencies: http://www.telstra.com.au/mobile-phones/coverage-networks/networks/
The 2100 frequency on their 3G or NextG (3.5G) may have been turned off at this point; I don't remember. They may still be using it for legacy phones and people on bring your own phone plans but I beleive they had wanted to either shut it down or sell it to another carrier. I don't recall that my SGS2 got 850 ... I just noticed there's tabs on the Telstra page that explains their coverage. Click on them and that's more accurate than what I just typed
I suspect your problem is that you may not be in an LTE covered area. Either that or its your APN settings. Let us know how it goes.
EDIT: Sorry, I didn't read your post properly that the SIM works in another device. If it isn't your APN settings, you can take it to a Telstra store and ask them if they know what the problem is. On occasion they do know what their talking about. You can point them at this web page if need be and it might encourage them to look a little deeper:
http://www.morecellphone.com/compar...d-xt925-vs-motorola-droid-razr-hd-xt926/39060
[
pandabear said:
Can you please provide an update. Did you manage to flash the Testra fw and latch in to the LTE 1800 band?
Click to expand...
Click to collapse
I no longer have this device, and unfortunately never tried flashing the Telstra firmware on the device.
PantsDownJedi said:
you can take it to a Telstra store and ask them if they know what the problem is. On occasion they do know what their talking about.
Click to expand...
Click to collapse
The device that I had was sourced from Rogers Canada, and didn't support LTE 1800MHz out of the box. They wouldn't have been able to help.
PantsDownJedi said:
The 2100 frequency on their 3G or NextG (3.5G) may have been turned off at this point; I don't remember. They may still be using it for legacy phones and people on bring your own phone plans but I beleive they had wanted to either shut it down or sell it to another carrier.
Click to expand...
Click to collapse
Telstra's 3G 2100MHz network was part of 3GIS, an agreement between Telstra and VHA, which ended on August 31st. Telstra still uses the 3G 2100MHz network frequency, it is actually part of their Next G network now, they however do not advertise this, as very few sites are still using this network frequency, and it is far more important to have a device that supports 3G 850MHz. Telstra lost quite a few 3G 2100MHz sites when 3GIS closed, although all of the areas would have had 3G 850MHz anyhow, so it was not really a big deal.
Dear All,
I recently got this device in Hong Kong and is hapi with its performance!
But I am still wondering if this device could actually use the LTE available in HK?
I knw the msm8960 claimed to be capable of utilizing all frequency of radio,
so is it possible that there is some soft lock in the baseband?
Could i flash the baseband or replace the modem driver from other device to access other frequency?
any idea is appreciated!
Thanks!
Vasco
I think it has to modifiy the ROm and the hardware
I tried to figure out, if our Photon Q is supporting more LTE bands than 1900 MHz (#2 or/and #25).
-> http://en.wikipedia.org/wiki/E-UTRA#Frequency_bands_and_channel_bandwidths
On some sites there are reports for having another band. (Have to search again, I think it was 850 MHz, #26 or 700 MHz, #12/#17/#29.)
I have also searched for supported frequencies for MSM8960.
I found some BlackBerry devices based on that SoC and 2 different versions of supported LTE bands.
One version (UK) supported 4 in europe used bands und the other version (US) supported 4 in US/Canada used bands.
I think that the Photon Q is like the BlackBerry US version and supports 4 LTE bands in US/Canada.
If you need a few sites, I will search again and show it to you.
The strange thing is, if I set to LTE only (via 4636) I can see all 4 carrier (germany).
We have 3 bands with LTE on it, but I can only get signal to max 2 of them.
Band 3, 7 and 20 (1800, 2600, 800 MHz).
The weird thing is, that on band #20 (800 MHz) only 3 carrier are active, so it has to be band #3 or #7.
Maybe I'm missinterpreting things and thats just a sideeffect of crossing bands of LTE US and UMTS Germany.
On stock ROM there was another "secret phone code" to see what the phone-part is doing. (From qualcomm I believe.)
I think I will test it some other day, to see which band is active.
At last, I was never been able to "login" or "register" into my carriers network within LTE.
Please discuss about that possibility, I really want to find out, which frequencies are supported by our phone on LTE.
Loader009 said:
I tried to figure out, if our Photon Q is supporting more LTE bands than 1900 MHz (#2 or/and #25).
-> http://en.wikipedia.org/wiki/E-UTRA#Frequency_bands_and_channel_bandwidths
On some sites there are reports for having another band. (Have to search again, I think it was 850 MHz, #26 or 700 MHz, #12/#17/#29.)
I have also searched for supported frequencies for MSM8960.
I found some BlackBerry devices based on that SoC and 2 different versions of supported LTE bands.
One version (UK) supported 4 in europe used bands und the other version (US) supported 4 in US/Canada used bands.
I think that the Photon Q is like the BlackBerry US version and supports 4 LTE bands in US/Canada.
If you need a few sites, I will search again and show it to you.
The strange thing is, if I set to LTE only (via 4636) I can see all 4 carrier (germany).
We have 3 bands with LTE on it, but I can only get signal to max 2 of them.
Band 3, 7 and 20 (1800, 2600, 800 MHz).
The weird thing is, that on band #20 (800 MHz) only 3 carrier are active, so it has to be band #3 or #7.
Maybe I'm missinterpreting things and thats just a sideeffect of crossing bands of LTE US and UMTS Germany.
On stock ROM there was another "secret phone code" to see what the phone-part is doing. (From qualcomm I believe.)
I think I will test it some other day, to see which band is active.
At last, I was never been able to "login" or "register" into my carriers network within LTE.
Please discuss about that possibility, I really want to find out, which frequencies are supported by our phone on LTE.
Click to expand...
Click to collapse
Dear Loader009,
Thanks for your information! I'm really impressed that you could actually search the carrier in 'LTE only from Germany!
Could you please share the version of ROM you are using?
And if possible, any screenshot? I really want it can be used in HK with LTE(1800, 2100 & 2600Mhz)
Also do you have more information about the secret phone code? I think it would be interesting
Actually, I noted that xt925 and xt905 are using the same chip MSM8960 with LTE usable in HK.
Is there anyone can locate the radio/baseband of their rom and port it for XT897?
I am willing to try it with my machine.
If this work, I think we could use this photon q all over the world!
Any idea?
Regards,
Vasco
disablewong said:
Dear Loader009,
Thanks for your information! I'm really impressed that you could actually search the carrier in 'LTE only from Germany!
Could you please share the version of ROM you are using?
And if possible, any screenshot? I really want it can be used in HK with LTE(1800, 2100 & 2600Mhz)
Also do you have more information about the secret phone code? I think it would be interesting
Actually, I noted that xt925 and xt905 are using the same chip MSM8960 with LTE usable in HK.
Is there anyone can locate the radio/baseband of their rom and port it for XT897?
I am willing to try it with my machine.
If this work, I think we could use this photon q all over the world!
Any idea?
Regards,
Vasco
Click to expand...
Click to collapse
Of course, I was just blind guessing the hardware for xt926 and xt907 are using the same hardware.
If not, there should be one chip controlling the modem channel of the device to be replaced.
But WHICH ONE???
Any expert in this area can solve this question? I am a dummy for radio stuffs
This seems like it's getting pretty interesting.
Sent from my XT897 using Tapatalk 2
Dear all,
I'm also very interested in this topic since I imported a Photon Q to Germany and was wondering if it's possible to use the local LTE 800/1800/2600 bands.
I think the first thing we have to find out is whether the hardware is capable of using other bands than the 1900 band listed on the Motorola website. As Loader009 states he could see LTE carriers which are known to use different bands I assume the hardware can do it. Otherwise the carriers wouldn't have been listed, right? Maybe someone from another country with different frequency bands can check and confirm that he can see those carriers as well?
Thus, the limitation to the 1900 band should be software-made and could be modified by a developer. I hope someone can participate at that point as I don't know much about coding...
I'm using CM10.1.
I can't remember the secret phone code, I have to do research again.
This secret phone code only works on Stock ROM. (I stupidly deleted it, when it wasn't working on CM10 anymore.)
The one secret phone code I used to force "LTE only" was *#*#4636#*#*.
Please DON'T change the baseband (don't even tap on it).
This can do problems to you. (I had to use QPST to recover the supported frequencies.)
Also, developers (afaik) can't modify the modem firmware.
We also don't even know, which LTE bands the Photon Q is capable of. (Except 1900 MHz)
I've got my 32GB SDCard back and will test it in the next few days out.
I hope I'll find that secret phone code, I'll also make a few screenshots.
Got the code!
##33284# <- ##DEBUG#
It only works on stock afair!
I'll test tomorrow, it's about 3am now >.<
disablewong said:
Dear All,
I recently got this device in Hong Kong and is hapi with its performance!
But I am still wondering if this device could actually use the LTE available in HK?
I knw the msm8960 claimed to be capable of utilizing all frequency of radio,
so is it possible that there is some soft lock in the baseband?
Could i flash the baseband or replace the modem driver from other device to access other frequency?
any idea is appreciated!
Thanks!
Vasco
Click to expand...
Click to collapse
I have read the "QU_SnapdragonS4_White_Paper_FNL_Rev6.pdf" and found there following entry:
-----------------------------------------------------------
• Industry’s first fully integrated 3G/4G world/multimode LTE Modem: <<<Supports all of the world’s leading 2G, 3G and 4G LTE standards>>>.
It also includes integrated support for multiple satellite position networks (GPS and GLONASS) as well as short range radios via Bluetooth,
WiFi, FM and NFC.
• Designed for speed, compatibility and power savings:
Snapdragon S4 Processor MSM8960 chipset includes the industry’s only complete platform that integrates all of the world’s leading 2G, 3G and 4G mobile broadband modem technologies on a single chip. This new integrated multimode modem is based on an advanced, programmable architecture that is performance, size and power optimized for the fastest combination of modems available for:
- LTE FDD/TDD (Cat3)
- 3G (DC-HSPA+ Cat 24)
- EV-DO Rev. B
- 1x Advanced
- TD-SCDMA
- GSM/GPRS/EDGE NFC.
Multimode/Multiband Means Worldwide Coverage.
• Support for multiple radio frequencies: Mobile broadband technologies are growing increasingly complex in their implementation. LTE is currently being implemented in over 40 diff erent radio frequency bands throughout the world. To complement its wide range of modem standards supported, Qualcomm has designed the Snapdragon S4 Processor MSM8960 CHIPSET platform to <<< address all commonly-used frequencies (from 700–2600 MHz) and bandwidths up to 20 MHz>>>, allowing its customers to address any mobile network opportunity whether the simplest single frequency implementation to the most extensive multi-frequency global mode, whether 4G, 3G or 2G.
-----------------------------------------------------------
Based on the document the chip can handle all LTE Standards, but it depends on his "advanced, programmable architecture"....as written there and how Motorola / Sprint implemented this, maybe they reduced LTE only to one Standard.
I don't have LTE in my area and so I cannot test this.
That's possibly right.
Something else:
If I remember correctly, somewhere in this forum have been said that for CDMA the internal Sprint "ID"(?) is used.
Maybe that's also the reason why I cannot connect to LTE in my area.
The phone is trying to "login" with the Sprint ID and this of course won't work.
The ##DEBUG# menu wasn't helpfull. It shows frequencies for american standards and not for GSM/WCDMA.
Also the LTE menu is also not very helpfull, it doesn't show frequencies at all.
Any News on this topic?
Maybe one of the developers can give a statement?
Yesterday I tested a LTE compatible SIM card.
My Bro has a Samsung Galaxy S4 with 4G/LTE in my area.
So I've put his SIM-Card into my Photon Q and set LTE only.
I had no luck, the Phone couldn't register into the network for this SIM.
I guess either it has the wrong frequencies or LTE is for inbuilt "SIM" (Sprint SIM?) only.
The latter. LTE is configured only for 1900 MHz which Sprint uses.
LTE is configured only for Sprint's frequencies, however, it supports the United States frequencies of PCS blocks A-G. The G Block is Sprint's current LTE channel, and they may deploy it later on Blocks A through F, depending on if they own the spectrum in a given market. The reason you see EU networks when the phone is in LTE Only Mode is most likely because the Phone still sees GSM signals, but will only connect to LTE ones from those GSM signals. Likewise, in the US, if you force LTE Only and then search for networks, AT&T and T-Mobile US will come up as the GSM carriers the Photon Q sees, rather than the LTE signals it sees.
Setting the Photon to LTE Only will not do anything for LTE in the EU. I suspect that if another carrier in the EU uses the 1900 MHz for LTE, the Photon Q will have no issues connecting to LTE in Europe. But until that time, be happy with HSPA.
Skrilax_CZ said:
LTE is configured only for 1900 MHz which Sprint uses.
Click to expand...
Click to collapse
Can this configuration theoretically be changed / other frequencies be added?
Only if you break BP security.
Skrilax_CZ said:
Only if you break BP security.
Click to expand...
Click to collapse
Sorry, what's that?
IIRC The only place with 850mhz LTE available is the Chicago market and currently no phones at all support it. :crying:
Not only does your phone need to support it, your PRL and cell-site does too...
Im wondering if anyone has gone from the Desire Z to the Galaxy S Relay 4G in Europe.
I ask for Europe to make sure it is compatible with most networks over here.
I see there is even ROM development over here with 4.4.4 running I imagine codename "Android L" will probably run as well
Thank you for the comments.
A few have had posts in the q&a or maybe general section, there aren't many posts at all here so I'm sure with minimal effort you'll find the ones I'm referring to
Sent from my Nexus 4 using XDA Premium 4 mobile app
riahc3 said:
Im wondering if anyone has gone from the Desire Z to the Galaxy S Relay 4G in Europe.
I ask for Europe to make sure it is compatible with most networks over here.
Thank you for the comments.
Click to expand...
Click to collapse
I went from Desire Z to Galaxy S Relay, it works well in Norway.
You need to unlock the phone from T-Mobile, see this thread http://forum.xda-developers.com/showthread.php?t=2255892.
Be aware that this phone is not enabled for 4G (LTE) network, only 3.75G (HSPA+). HSPA+ is marketed as 4G in USA, not in Europe.
raphaelcno said:
I went from Desire Z to Galaxy S Relay, it works well in Norway.
You need to unlock the phone from T-Mobile, see this thread http://forum.xda-developers.com/showthread.php?t=2255892.
Be aware that this phone is not enabled for 4G (LTE) network, only 3.75G (HSPA+). HSPA+ is marketed as 4G in USA, not in Europe.
Click to expand...
Click to collapse
3G works in Norway too?
I think by frequencies sadly 3G wont work here where Im at A shame.
900 MHz 3g doesn't work!
I upgraded too from Desire Z to Relay, didn't even realize any 900 Mhz problem. I get always an H or E icon (HSDPA or EDGE), so 900 MHz should be working.
According to specs, the phone should work with these networks:
2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 850 / 1700 / 1900 / 2100
I have it in Telekom in Slovakia and in the meantime I travelled to NY and got no problem at all (I had it set to manual network selection to save roaming charges).
The phone I bought via ebay was locked (even the seller described it as unlocked) but after firmware downgrade I easily unlocked it. I recommend LiquidSmooth ROM, you'll fall in love with that phone!
My other finalist was Moto Photon Q, it supports GSM but lacks SIM card slot. If you want, there's a guy in Prague, the author of the sim card mod instruction post on xda, that can do it for you. But I chose the easier way. Now I have a small problem with display flex cable (probably too much openings/day) so I'm considering buying another Relay before they're gone with no decent qwerty phone around. And I can leave the current one for spare parts. I had to put away my DZ because of the keyboard. Some keys started to write several characters instead of one and there was no easy way to fix it.
FYI ebay deals in your name with customs, so they charge you immediately and the phone is delivered to your door without customs holding it for a week.
If you wish to
T699 in the UK
Hi.
I did not owed the HTC, I used an Xpreia Pro prior to my S4 Relay. However I have the S4 relay for almost 1 year and I had no problems using it in the UK. I have traveled in Europe (France, Germany, Austria, Hungary, Romania) and I was able to use it without any problems. AFAIK it works just fine on 900 Mhz but in 2G. The big question is what freq of 3G is your network provider using. For example, in UK I'm on EE network which is using 2100 Mhz for 3G and 1800 Mhz for 2G so the device works perfectly. Ifyou are on Movistar Spain than your phone will work fine, since the company is offering 2G on: 900/1800 MHz (both supported by S4 relay) and 900/2100 MHz UMTS ( from which 2100 is supported by the device). In very simple translation 2g will work everywhere without any problem, it might happen that is some places you will not get 3G signal.
Hope it helps.
Emil
Hello,
I've got a LG Phoenix 2(K371) phone that I bought from Bestbuy and unlocked through AT&T
The phone is supposed to support the UMTS B1(2100 Mhz) frequency (as stated in specs).
I'm in North Africa right now for a business trip and unfortunately I wasn't able to get any 3G data with the local carrier that uses the UMTS 2100 Mhz frequency, I'm stuck with only 2G while my other phone works just fine.
I tried to change my Network Mode from 4G to 3G but the Network mode menu is missing!!!!!!
My questions are:
1- Does the K371 really supports the UMTS 2100 Mhz frequency ?
2- How can I change my Network mode from 4G/Lte to 3g/WCDMA?
Thanks
Did you ever get this sorted out? I am in Germany and can only get 2G also.
Same here in the UK! Only 2G.
My understanding is that either the official specifications of the phone are wrong - it doesn't support the HSDPA frequency of 2100 MHz, or (most likely) this frequency is disabled in the phone software settings since [email protected] doesn't use this frequency in the US. In any case it is very frustrating: I bought this phone convinced it is going to work while I am travelling in Europe, but obviously it doesn't as 2G data connection is useless.
Same problem in SE Asia. Phone doesn't have the right LTE bands but HSPC should work. Only getting 2G. No option in the hidden menu to change the modem RAT settings that I can see. *#546368#*371#
Anyone have any luck using the k371 overseas?
Same here...
I tried every single method I know in hopes that I could root the phone, but no luck!!!
I believe at&t disabled the said frequencies....
Our only bet is a proper root, and a custom rom..
any update on no UMTS 2100Mhz?
any solutoion on this issue?
I have found a solution. I am using it outside the US. I contacted my cellular provider, gave them the phone name (LG K371) and they sent me a text message with automatic settings for their data network. As soon as I opened it, I got a message like "data settings have been updated" and now it works on 3G and 4G without any issues. You may also be able to find these data configuration settings on your cell service provider's web site.
Seriously???
Please let me know is it AIRTEL service? since i am from INDIA.
we have the same problem in 2 mobiles..
Hmmm
I tried of calling and received setting for MMS , GPRS, INERNET but still i m seeing 2G symbol as E - edge detection
Please help me
Hi this is sainath
am also facing same problem, any one got solutions
please give reply.
tromal said:
Hello,
I've got a LG Phoenix 2(K371) phone that I bought from Bestbuy and unlocked through AT&T
The phone is supposed to support the UMTS B1(2100 Mhz) frequency (as stated in specs).
I'm in North Africa right now for a business trip and unfortunately I wasn't able to get any 3G data with the local carrier that uses the UMTS 2100 Mhz frequency, I'm stuck with only 2G while my other phone works just fine.
I tried to change my Network Mode from 4G to 3G but the Network mode menu is missing!!!!!!
My questions are:
1- Does the K371 really supports the UMTS 2100 Mhz frequency ?
2- How can I change my Network mode from 4G/Lte to 3g/WCDMA?
Thanks
Click to expand...
Click to collapse
Sorry for a late reply, but here's the real scoop about the LG K371 (AT&T)
First, being a "cheap" LG phone, there are very few bands actually included, and they only cover the main (not all) AT&T US frequencies, therefore it's no surprise that doesn't work on all overseas carriers. Again, they are covering only major US bands, and despite what it shows on the box or specs it may not be always true. B1 (2,100Mhz) band has different sub-bands, therefore it doesn't mean that the US B1 will work on an overseas B1, let alone the air-interface (2G/3G/4G/LTE) may not all be supported even if this sub-band exists.
Second, being that it's an AT&T phone, they are knows to load firmware with major restrictions for band selection called RAT Restrictions, which cannot be undone unless you can reflash it with a non-customized firmware, but you can't do that either due to the locked bootloader. A better option is to always go with the un-customized or Tmobile K7/K8 because they always have a lot more bands enabled than the AT&T version. Better yet, go with a Samsung which have more bands even on the AT&T models.
Bottom line, "cheap" phones along with AT&T restrictions will not work everywhere, despite the specs, and there's nothing you can do about it.
And my favorite old adage is "You get what you pay for!" LOL
Hi I have a KoreanS6 (LG U+) SM-G920 and they don't use the 900 Mhz band with the 3G. I want to gift this phone to someone who lives in Cuba, over there, due to certain circumstances everything it's more complicated and recently they can use internet on their cellphones using 3G but the coverage is only on the 900 MHz therefore my KoreanS6 (LG U+) SM-G920 won't work at least with 3G. I have been gathering some information online and the specs for any S6 on LatinAmerica are pretty much the same, so I want to flash my KoreanS6 (LG U+) SM-G920 to S6 SM-G920I since this version has the 900 mhz 3G band, I have read people who succesfully have done similar things switching from Tmobile to Verizon and so on.
Also, I have gotten some answers telling me that I can't do this since these two phones are different models, this statement gets some contradiction with others who state that all hardware are the same and should not be an issue to do this flashing and "opening' this band. I would like some insides on this and any advice will be so much aprecciated.