yashsingh1/xdaforums huggingface dataset:
[Xiaomi Mi A1 Guides, News, & Discussion] kobe4rings:
I live in Puerto Rico and use T-Mobile. I had to change the language to spanish mexico and now it connects to LTE Band 4. Speeds are slow right now because the communication towers are devastated due to hurricane maria. Once they restore power to the Island I show be able to see regular speeds up to 80mbps
[Xiaomi Mi A1 Guides, News, & Discussion] croDREAD:
Hello. I have phone for day and had same issue when turned it on for first time. What worked for me was simply disabling and reenabling sim cards. Hope that will work for others. Cheers.

Poslano sa mog Mi A1 koristeći Tapatalk
[Xiaomi Mi A1 Guides, News, & Discussion] croDREAD:
My phone charges for about 90min, didn't change anything so don't know is that either good or bad...

Poslano sa mog Mi A1 koristeći Tapatalk
[Xiaomi Mi A1 Guides, News, & Discussion] b3wii:
Hi, i just bought the global xiaomi mi a1 for my mom here in Germany but i cant get the mobile data to work. Phone calls are working and so does wifi but i cant get any connection using mobile data. Do you guys have any idea? Does the phone need to be unlocked in oder to work in Germany?
[Xiaomi Mi A1 Guides, News, & Discussion] killed2:
No, the phone works without any problems in Germany. Did you try another provider/sim?
[Xiaomi Mi A1 Guides, News, & Discussion] croDREAD:
I had wrong internet settings since my provider didnt figured out which is my device. Search online settings and add it manualy.

Poslano sa mog Mi A1 koristeći Tapatalk
[Xiaomi Mi A1 Guides, News, & Discussion] Avisharma14:
Mi A1 unable to connect to LTE 4G on AT&T USA (california) network. Only 3G

Mi A1 unable to connect to LTE 4G on AT&T USA (california) network. Only 3G. Any help would be appreciated.
[Xiaomi Mi A1 Guides, News, & Discussion] sednafx:
I'm on AT&T as well. Only have band 17 near me, so no LTE for me either.
[Xiaomi Mi A1 Guides, News, & Discussion] azthemansays:
Make sure to input the APN settings for your provider.
[Xiaomi Mi A1 Guides, News, & Discussion] b3wii:
I guess that did it. I ran the SMS Service app and suddenly the mobile data started working.
[Xiaomi Mi A1 Guides, News, & Discussion] sgs.soheil:
does global version support 4.5G?
[Xiaomi Mi A1 Guides, News, & Discussion] armaman:
Yes supports. This week I saw it on my device.
[Xiaomi Mi A1 Guides, News, & Discussion] Alejo The Media:
I found this useful video that basically explains that the MIA1 does not have the 1900 band, which I need it in my country to run Movistar :( Im from El Salvador. (I Speak Spanish) [YOUTUBE]https://www.youtube.com/watch?v=KD_paHbXTjE[/YOUTUBE]
[Xiaomi Mi A1 Guides, News, & Discussion] pooniaprashant:
Supported bands in Mi A1

GSM	B2, B3, B5, B8

UMTS	B1, B2, B5, B8

FDD-LTE	B1, B3, B5

TDD-LTE	B40, B41(2555-2655MHz)

source: mi.com
[Xiaomi Mi A1 Guides, News, & Discussion] Manuel Marta:
What's your carrier network? because i'm in Mexico as well but i'm not getting LTE on movistar

De que compañia eres yo tambien estoy en Mexico y no me agarra 4g lte en movistar pero si en telcel
[Xiaomi Mi A1 Guides, News, & Discussion] engloa:
Kindly edit your posts and add English as stated in the forum rules

Thanks
[Xiaomi Mi A1 Guides, News, & Discussion] maurock00:
Amigo haz probado si funciona con una SIM de Movistar ? please ayudame probando si puedes !!
[Xiaomi Mi A1 Guides, News, & Discussion] planeador81:
Hi, im from argentina, and i cant use 4g in personal carrier... i understand that mi 1a have band 4 of lte... but its imposible to connect... any help?

i try change apn, try *#*#4636#*#* but nothing change..
[Xiaomi Mi A1 Guides, News, & Discussion] Vegas1138:
Hi Guys,

I'm from Guatemala (central america) Can someone please tell me if somehow I can unlock the LTE Band 2 (1900) my carrier witch is Movistar only use that band for 4G LTE.

I already try all the latin american countries listed at the beginning of the initial setup of the phone but no one seems to work or enable 4G LTE.

is unbelievable that my 2 years old Huawei have a lot of bands enable for the 4G LTE and this new and great phone doesn't!

This is a kinda WTF situation.

Hola chavos,

Soy de Guatemala (Centroamérica) ¿Puede alguien decirme por favor si de alguna manera puedo desbloquear la Band 2 LTE (1900)?

Mi operadora es Movistar y aca en guatemala solo esa banda usa para 4G LTE.

Ya probé todos los países de América Latina enumerados en el comienzo de la configuración inicial del teléfono, pero parece que ninguno funciona o habilita 4G LTE.

¡Es increíble que mi Huawei de 2 años de viejo tenga muchas bandas para el 4G LTE y este nuevo y excelente teléfono no!

Esta es una situación un poco jodida!
[Xiaomi Mi A1 Guides, News, & Discussion] iankurgarg:
Hi, can you post the steps you did in order to get the B4 band unlocked.
[Xiaomi Mi A1 Guides, News, & Discussion] comatron:
i bought a "global" one in germany via gearbest but don´t get 4g (LTE band 20 in my case). anyone got advice what to do? i read about injecting stuff into nvram but i don´t know how to do that. i appreciate any help. ive set the APN with different settings but no LTE here.
[Xiaomi Mi A1 Guides, News, & Discussion] Kookaburra88:
Found an interesting solution in this video @15:55 min:

[youtube]bR64acqhhEA[/youtube]

Settings->Network & Internet->Mobile Network->

Then flip the toggles for "Data Roaming" & "Preferred Network Type" a few times

Can't test it, since I'm not facing this issue
[Xiaomi Mi A1 Guides, News, & Discussion] basanta_nayak:
Xioami Mi A1 LTE Band missing for Lycamobile

Hello,

I just wanted to share my experience with this pathetic Mi A1. I purchased from eBay USA Florida seller . The phone was impressed at my first look but for Lycamobile only 4g network is coming .While calling to anyone internet totally stopped even you can't drive car with Google GPS.Even I tried to network preference to 3G , no network is coming means 3G Banda are missing for Lycamobile which uses T-Mobile network. Even you can not reliable on this phone at USA as some places like hill station/remote places you will not get LTE and you will face nightmare. I am in process return to eBay but seller says it works for T-Mobile and most strange part is eBay site they mentioned these network specifications but inside box manual it is lesser bands, I don't understand why xioami release this type of phones and says worldwide can be used shame to the bloody guys.

eBay site listing network.

Network:

2G: GSM 850/900/1800/1900MHz

3G: Band B1/B2/B5/B8

4G: FDD-LTE B1/B3/*B4/B7/B8/B20 TDD-LTE B38/B40

Screenshot which other guys upload for the inside manual bands are same missing band B4/B5 for Lte. 3G bands are missing B2/B5
[Xiaomi Mi A1 Guides, News, & Discussion] Powered by SRAM:
My manual also does not list the B4 band...but my phone has it. The box my phone came has a small red sticker on the side that says "Global Version".
[Xiaomi Mi A1 Guides, News, & Discussion] basanta_nayak:
MI A1 LTE and 3G bands are missing for Lycamobile

Dear Friend,

You might get over Germany but at USA every carrier has different band frequency. Phone's first things is the network and without that how xioami says global version. Definitely this phone won't work for different carrier even biggest concern is that whatever they said in advertising bands they don't have really and you will came to know after received . That time you will be clueless and seller plays roller coaster to return this. Anyway you got the network enjoy
[Xiaomi Mi A1 Guides, News, & Discussion] Powered by SRAM:
I bought my device through a vendor on Aliexpress.

I'm in Southern California and so far the B4 4G coverage has been pretty good for me. I'll sometimes see 3G if I go inside a building. Buying this device can be hit or miss if you're not in the part of the world that it's designed for.

Hope you get your phone sorted.
[Xiaomi Mi A1 Guides, News, & Discussion] t-bon3:
I have the Indian version of the A1 which has the most limited selection of LTE bands available :crying: :(

http://www.mi.com/in/mi-a1/specs/

At some point I will try flashing the fastboot global version ROM to this device to see if this enables the other LTE bands. :fingers-crossed:
[Xiaomi Mi A1 Guides, News, & Discussion] comatron:
damn, that WORKED. but it took some time and was very random. thanx man!
[Xiaomi Mi A1 Guides, News, & Discussion] oktubr3:
Did someone check this?

https://xdaforums.com/redmi-note/general/unlock-lte-bands-step-step-xiaomi-mi-t3084774
[Xiaomi Mi A1 Guides, News, & Discussion] ArcherRojas:
Hello guys for those from mexico and latin america places Im so sorry to say that if you are using the Movistar Carrier or one carrier derivated from Movistar you will never get 4gLTE on your phone because the phone does not have the ability to connect to the 4gLTE network of this carriers and since its a hardware issue you wont get this bands on the phone sadly I myself use movistar and Im already considering to change to Telcel :(
[Xiaomi Mi A1 Guides, News, & Discussion] Trusconi:
I lost 4G+ B5 screenshot :(
[Xiaomi Mi A1 Guides, News, & Discussion] gplsource:
I usually use two SIM cards, one from Movistar and another from Virgin Mobile, but now I have changed Movistar to Unefon (AT&T carrier) and it works fine.
[Xiaomi Mi A1 Guides, News, & Discussion] mzsquared:
Thanks!, Very informative posts. I'm gathering all available information about enabling extra band frequencies while am awaiting delivery for Elephone U Pro, Global. It has Qualcomm 660 SoC and I'm hoping that I can make it work here, in the US. The phone itself has very interesting specs, I think they nicknamed it "a poor man's Samsung S9" It looks sharp.
[Xiaomi Mi A1 Guides, News, & Discussion] josep0512:
Bands LTE? Venezuela

I am from Venezuela I will buy at amazon.com (USA) a xiaomi mi a1 I have 2 lines with lte one in band 4 and another one in band 3. this phone supports both bands for LTE and I can choose which sim card to use for data When I run out of my data rate ?.
[Xiaomi Mi A1 Guides, News, & Discussion] fperealv:
Cuanto te costo el env
[Xiaomi Mi A1 Guides, News, & Discussion] taiwan#1:
I also got Mi A1 recently and found there is no 4G LTE coverage in my residential area (Calif, US). However, my old and slow ZenFone 2 Laser (ze551kl) does have 4G (but poor) connectivity in my home. I've also done reseting the phone with 4G LTE SIM, or changing language to Spanish in Mexico region, and nothing works but still gets AT&T 3G signal here. So, I decided to change the NVRAM setting. I also curious about which bands should be added to the phone to maximum the coverage support in North America. Because I don't want just support the bands of AT&T, if I go some places where the AT&T coverage is poor or none, I still need other carrier's signal to have the emergency call.

I found the "global version" has actually very limited LTE bands support.

Global: LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 38(2600), 40(2300)

China: LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500)

Hong Kong: LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 20(800), 38(2600), 40(2300)

My another R1 HD has LTE support. I checked supported bands are only 2 4 7 12 17.

I also checked another phone (ZenFone3) ZE552KL, which is also based on Qualcomm Snapdragon 625 SMS8953 platform

Global version: FDD-LTE (Bands 1, 2, 3, 5, 7, 8, 20)

TW/JP/HK/PH/SG version: FDD-LTE (Bands 1, 2, 3, 5, 7, 8, 18, 19, 26, 28) TD-LTE (Bands 38, 39, 40, 41)

US/BR version: FDD-LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 28)

I also checked wikipedia for the LTE bands used in NA. Finally I decided to use bands 2 3 4 5 7 8 12 17 29 30.

The good thing about using QPST/QXDM to modify NVRAM for Mi A1 does not require root your phone. Just dial *#*#717717#*#* and the "USB port diag" will be enabled. Plug to your Win10 PC, and have QPST/QXDM installed, I'm able to modify the lte_bc_config.

After I modified the value and reboot, I still have no LTE coverage and the network is still AT&T 3G. So, I just give up. However, I went to another city nearby, Mi A1 can have 4G connectivity, although the speed test is not good, about 7Mbps dl and 3Mbps upload. It is better than 3G speed I tested at home which is 3Mbps dl and 0.5Mbps upload. And due to poor 4G coverage, I always limit my old phone to use 3G network. So now it is acceptable for me because Mi A1 will always use 3G network at home, and can switch to 4G in outdoor with good coverage.
[Xiaomi Mi A1 Guides, News, & Discussion] anton_87:
Thanks for your input, I also live in California; I live in southern California specifically not to far from San Diego. I just bought my Mi A1 from Amazon which turned out to be the "Global version." I have T-Mobile and have yet to connect to 4g, let alone LTE, out here in my area and I have been at my wit's end trying to figure out if I could somehow unlock bands 2 and 4 on my phone to get my connected on 4g. I have seen others in California state that there are some places where they can connect to 4g, like in the LA area, but not in my area! I have been trying to root my phone also to see if that works but no luck so far as many videos describing how to do it are from India and it seems that their phones are slightly different than mine or they leave out steps that leave me lost. I would love to find a step by step guide and hear of a success story. I don't even have the Oreo update on my phone. If I could get Oreo and 4g I would be set for life, or at least the next couple years with this phone! Anyone in a similar situation that can point me in the direction to get Oreo and 4g on my Mi A1?! I'll even pay for a guide!!!
[Xiaomi Mi A1 Guides, News, & Discussion] taiwan#1:
For other cellphones, they have to root their phone in order to get USB diag mode. In Xiaomi Mi A1, you can just go to phone app, and press #*#*717717#*#* in the number pad, then a small toast message should just pop out and saying USB diag mode has been enabled. Form now on, you can follow the other posts mentioned how to unlock LTE bands step by step using QPST and QXDI tools.

Another thing you can try is dialing "*#*#4636#*#*" in the phone app, and get into "phone information", change the "preferred network type" to LTE/WCDMA or LTE/UMTS. I have no idea why my default setting after every reboot is always "TD-SCDMA/CDMA/UMTS", it does not make sense because this is not a CDMA phone and TD-SCDMA is only deployed in China, and the default has no LTE.

The problem I have with my Mi A1 is I cannot always get 4G LTE (even my old Snapdragon 615 cellphone can always get 4G around my working and living area) and don't know how to figure out the which and actual Multimode Multiband Power Amplifier used on Mi A1. You can always unlock all LTE bands but most of them won't work because the amplifier does not support the LTE bands. According the the manual shipped within the package, I can only see LTE bands 1,3,5,7,8,20,38,40. But when I read out the original lte_bc_value, it does include band 4. I don't know why but can just think this phone might be returned from someone who had change the default value. But anyway I still cannot get AT&T 4G LTE even band 4 is already there.

After some tweaks I am lucky and can have 4G or LTE in some area in the city, but now always. However, I'm still figure out which band is supposed to set for my carrier AT&T. Although I know all their supported bands, I don't know whether the cellphone amplifier supports it or not.
[Xiaomi Mi A1 Guides, News, & Discussion] emprazol:
Could someone edit qcn for career aggression for b3+b7?

Here 4g+ is on those bands

I have mi5 and edited qcn is present on the net and 4g+ is working well on that phone

But on A1 is only 4g
[Xiaomi Mi A1 Guides, News, & Discussion] Remgrado:
Nice
[Xiaomi Mi A1 Guides, News, & Discussion] mzsquared:
I don't have Xiaomi Mi A1 but I see similar problems here that I have with my Elephone U Pro. Very nice phone, 6GB RAM, 128 GB internal storage running on Qualcomm 660 SoC.

I already have a root, thanks to skeleton1911 https://xdaforums.com/member.php?u=4626501 - more development on this phone is in the works...

The problem am having at this moment is that I can't run QFIL in backup mode, the blue buttons are partially grayed out, the backup/restore is not available. I have a sim inside, it's an old Tmobile sim, not in service but the phone recognizes it. So, I'm wondering how can I make the QFIL work, do the backup an try to expand LTE bands after that. I have used the QFIL for flushing the stock ROM and to get root, and that worked well. The phone has already Oreo in it, was shipped that way.

The phone has 'global' factory baseband, I will need B2,4,5,12,66(ext.of4) and 71 to have this phone fully functional here, in the US. Right now the phone seem to communicate with TMobile towers on Band4 but only GSM, 2G. Would you have any suggestions about what to try to make it work? Thanks.

https://drive.google.com/file/d/1tw3JfiFqjkJDxePQ8LHeXsgaAyUHkWV_/view?usp=sharing

https://drive.google.com/file/d/1DUyG3r58lK0BjXIrWgW4TUP2t9mPAGXx/view?usp=sharing

https://drive.google.com/file/d/1g8JtL11RlLMngGSWrcX_56Ms0cj2JO3M/view?usp=sharing
[Xiaomi Mi A1 Guides, News, & Discussion] Powered by SRAM:
I've been to the Mission Valley area and I get 4G. Mine has a red sticker on the box that said "Global Version". Bought mine from Aliexpress. I don't think you can unlock band 2. The Global Version has band 4...which gets me 4G pretty much everywhere I've gone.
[Xiaomi Mi A1 Guides, News, & Discussion] XiaomiLover:
Just OTA Update for B4 in Mexico

Guys,

If you live in Mexico and have a Xiaomi Mi A1, to activate B4 all you need to do is Do a OTA Update. I mean go to Settings then System then System Update (Well i'm in Android Oreo right now don't remember the previous Android path) and do a System Update with a LTE/4G Chip in the Cellphone. When it restarts it will connect to 4G/LTE.

Also make sure there is 4G exactly where you are since some companies don't have 4G /LTE in every part of a City.

I remember reading about selecting Spanish (Mexico) when prompted the first Xiaomi MiA1 configurations on first turn on also helped. But I have my system in English right now (maybe i changed it afterwards) and also Have B4 4G/LTE with Telcel.

Last test i did a few days ago in Puebla, Puebla, near CAPU, Telcel, says 81 Mbps pretty good. That's even faster than my home Fiber Optics. Pic:

imgur.com/a/9lfbK

So first also make SURE you have a 4G CHIP (LTE is the same thing), ask your network provider if you have this type of chip.

As a note, there has been updates every month, some large 1gb+ some medium 500mb. At the beggining i had 2 GB free of RAM, i think it's due to the way Android administers the RAM (does not means it is using the other half), but phone has been always fast. However now after patches and apps i notice an average of 1450MB of RAM available at all times, but i still feel the phone fast as usual but it worries me that update after update i may lose some more RAM lol.
[Xiaomi Mi A1 Guides, News, & Discussion] mafiaprinc3:
Redmi 5 Plus band 4

I have the Redmi 5 Plus Chinese version MEE7, has no support for LTE band 4 which is the only band supported in Jamaica for my carrier, however the global version supports band 4, did some research rooted and modified NV Ram values and can now see LTE band 4 enabled in network signal Guru but I cannot connect to LTE, any ideas what else I could do.

I know it's slightly different from the mi A1 but they use the same SD625 Chipset. I would really appreciate your help, not much dev available for Redmi 5 Plus as yet since it's a new phone
[Xiaomi Mi A1 Guides, News, & Discussion] findrome:
Very interested. [MENTION=539139]Adal[/MENTION]tovo What image did you flash?
[Xiaomi Mi A1 Guides, News, & Discussion] noobcurioso:
Por favor ensine a gente como se faz. Eu tenho problema semelhante ao seu. Obrigado
[Xiaomi Mi A1 Guides, News, & Discussion] chuardo:
Can we unlock Band 2?
[Xiaomi Mi A1 Guides, News, & Discussion] Nodierg1:
Can unlock B28 (700Mhz) APT?

In my country the all service providers using this band over LTE networks.

---------- Post added at 03:44 PM ---------- Previous post was at 03:42 PM ----------

Can unlock B28 (700Mhz) APT?

In my country the all service providers using this band over LTE networks.
[Xiaomi Mi A1 Guides, News, & Discussion] findrome:
Doimg a lot of digging on the specifics of the Snapdragon 650. I don't want anyone to think that I'm trying to delegate any responsibility, but some research needs to be done on what frequencies the 650 is capable of. If we can determine what frequencies are available to us, we can begin figuring out which bands we can enable.
[Xiaomi Mi A1 Guides, News, & Discussion] Nodierg1:
It´s possible activate LTE Band 28 in this device?
[Xiaomi Mi A1 Guides, News, & Discussion] mzsquared:
Here is one example for '650':

F5321 (Xperia X Compact)

UMTS HSPA+ 800 (Band VI), 800 (Band XIX), 850 (Band V), 900 (Band VIII), 1700 (Band IV), 1900 (Band II), 2100 (Band I) MHz

GSM GPRS/EDGE 850, 900, 1800, 1900 MHz

LTE Bands: 1,2,3,4,5,7,8,12,17,19,20,26,28,38,39,40,41

WLAN, 2.4G/5G, NFC

taken from: http://www.xperiablog.net/specifications/2016-xperias/xperia-x-compact/
[Xiaomi Mi A1 Guides, News, & Discussion] findrome:
That's great! It's a great place to start. MSM8956 is the right model number too.

Now to find a citation from the manufacturer for confirmation.

I'm not surprised to see this.

https://www.qualcomm.com/products/snapdragon/processors/650

Download PDF and see where it says x8 LTE

https://www.qualcomm.com/snapdragon/modems/comparison

Scroll down to X8 near the bottom. No reference to band capacity though. Found a reference to "all mode".

https://www.qualcomm.com/news/onq/2...-ready-smartphones-can-benefit-broader-mobile

This link indicates that 650 should be compatible with all current mobile technology.

Can anyone find OEM info on the snapdragon 650 used in the A1 not mentioned here?
[Xiaomi Mi A1 Guides, News, & Discussion] jareddlikewhoaa:
I'm on Band 4. The phone does support band 4 but ONLY AWS-1 Band 4, which T-Mobile has in my area thank god.
[Xiaomi Mi A1 Guides, News, & Discussion] findrome:
T-Mobile has an agreement with At&t that uses band 40 in lieu of TMO band 4 for roaming. Voice and text, no data though. I've enabled LTE bands 4,5, and 40, wcdma 2 and 5, and gsm pcs 1900. I'm on metro. I get decent coverage most everywhere and I run service in 6 counties. Aside from the dreaded network drop, my biggest issue is indoor reception.
[Xiaomi Mi A1 Guides, News, & Discussion] jareddlikewhoaa:
YES. Indoor Reception is terrible. I have had 100 Mbps outside before and walk not too far indoors and it's slashed down to 20-40 Mbps. I'm not complaining too much though, my biggest complaint is during the daytime hours, my speed maxes out around 20-40, but at night, like I said, I can get a max of 100.
[Xiaomi Mi A1 Guides, News, & Discussion] findrome:
Get your spectales and give this a look

https://xdaforums.com/mi-a1/help/mi-a1-network-fluctuation-custom-rom-t3796545/post76890810
[Xiaomi Mi A1 Guides, News, & Discussion] jareddlikewhoaa:
Hmm, thank you! I'll give it a try. I do use Network Signal Guru but I disabled every band besides T-Mobile supported bands to see if it would help stabilize it some.

---------- Post added at 08:58 PM ---------- Previous post was at 08:51 PM ----------

Although I'm not getting an LTE Band 5 for some reason.
[Xiaomi Mi A1 Guides, News, & Discussion] findrome:
Band availability varies by location. I've only hit 5 infrequently, as I recall; it came through as roaming. I wound up disabling it until I changed ROM. Still don't get it often though. Are you rooted?

---------- Post added at 10:38 PM ---------- Previous post was at 10:07 PM ----------

@jareddlikewhoaa

https://support.t-mobile.com/docs/DOC-4988

**Edit**

Band availability varies by region, even in network in contiguous US.