Unlocking LTE Bands

[ssuds]

Hey guys,

I'm really interested in picking up a 4c, and would be even more inclined to do so if LTE bands can be unlocked (Ideally bands 2, 4 and 12).

This has been done successfully in the past on Xiaomi devices (specifically the Mi Note Pro with the Snapdragon 810). Since the 808 shares a very similar architecture to the 810, I'm hoping it can be done on the 4c successfully.

Here are some resources and guides to start with:
http://forum.xda-developers.com/redmi-note/general/unlock-lte-bands-step-step-xiaomi-mi-t3084774
http://en.miui.com/thread-154862-1-1.html
http://forum.xda-developers.com/mi-...how-to-unlock-lte-frequency-bands-mi-t3215880
http://forum.xda-developers.com/oneplus-one/general/guide-unlock-aditional-bands-qualcomm-t2877031
http://www.xda-developers.com/remove-band-restrictions-qualcomm/

Hopefully someone with a Mi 4c is able to try and confirm their success!

 

[Stevex26]

That's very interesting! I wish also band 20 (800 MHz) could be unlocked since it's largely used in Europe.

 

[sandrixroma]

Mee too interested to unlock (if possibile) 800 mhz

 

[alvarillo88]

One more interested in the 800. :good:

 

[maxionline]

B4 (AWS)

Im up for B4 (AWS) :good:

 

[exploreresp]

doesn't have it unlocked but it seems it makes really no difference. Don't trust the few articles from people who did not even test...
I have LTE bands everywhere (work, home, way between) and I live in a zone where it is kinda hard to get...

 

[ssuds]

doesn't have it unlocked but it seems it makes really no difference. Don't trust the few articles from people who did not even test...
I have LTE bands everywhere (work, home, way between) and I live in a zone where it is kinda hard to get...

It depends a lot on what network you're on. The LTE bands that come enabled by default on the 4C don't support any US networks.

 

[ps2lover]

800 mhz (band 20) would be great

 

[boonkoh]

What LTE bands does mi4c support?

Does anyone know what LTE Bands the Xiaomi mi4c supports out of the box?

Been struggling to find a reliable source/list

 

[Flaxe]

Does anyone know what LTE Bands the Xiaomi mi4c supports out of the box?

Been struggling to find a reliable source/list

2G GSM 850/900/1800/1900MHz; CDMA BC0/BC1
3G WCDMA 850/900/1900/2100MHz; CDMA BC0/BC1
4G FDD-LTE: 1800/2100/2600MHz; TDD-LTE: Bands 38(TD 2600) / 39(TD 1900) / 40(TD 2300) / 41(TD 2500)

 

[ohmigother]

800MHz?

Hi,

Bought mi4c to find out that I can't get LTE working in my village

I live 12kilometers from a bigger city. There is LTE available in my village but I think they operate on 800MHz and in city at 1,6GHz.

I dreamed about using my new 4g connection here after 3years with Galaxy S3

I have to try these guides. Thank you for providing them.

Regards,

 

[Tony2k]

Noboby tried to unluck bands?

 

[ermacwins]

Wouldn't advise in case it bricks the phone. If there is a way to unbrick, then go for it it

 

[rob rich]

Wouldn't advise in case it bricks the phone. If there is a way to unbrick, then go for it it

In Snapdragon phones there is always a way to unbrick but it could be very frustrating and time intense

 

[Hnk1]

I have tested it on many of my snapdragon phones.

On some phones, it works flawlessly. On other, the signal strength is weaken but works nevertheless. However, some phones especially carrier ones have anti tampering mechanism which reverts the value back to original after restart. However, usually this is solved by a custom kernel and custom rom but then again, it gets really tough to get into diag mode in custom modes.


Never had any problems.

But you MUST backup your EFS partition via recovery or using QPST / QXDM else you would have a lot of problems if you messed up the values like no signals or broken wifi or sensors etc. and SAVE them on your phone as well as on your PC. (at least two backups)

As long as you take the above two precautions, you will never mess up your phone!

 

[regspy]

Its supports LTE band 3 and 7 which is mostly used in europe, middle east and asia. However even after you select "Prefer LTE" from the setting it might not connect.

You can try this (this will change on reboot so will try to see if i can change within the code):
1. Enter *#*#4636#*#* in the diapad.
2. Select phone information 1 (there are two sims so select the first one)
3. Change to LTE/WCDMA (if it doesn't connect to LTE then try "LTE only" and then change it to LTE/WCMDA)

If the above doesn't connect to LTE then your carrier is offering LTE at a different frequency.

For me atleast the default APN were wrong, so i had to manually change the APN restart and then do the dialer thing.

 

[AndrewIT]

3. Change to LTE/WCDMA (if it doesn't connect to LTE then try "LTE only" and then change it to LTE/WCMDA)

There is NO LTE/WCDMA option only. Please see screenshot and point out what option I'm supposed to pick
screen shot of "phone information 1" --> http://imgur.com/BELHKaO

Which one of those am I supposed to tap on?
I picked "TD-SCDMA, WCDMA and LTE" but that broke network connectivity.

EDIT: Please also take a look at this: http://imgur.com/gallery/yzIHD49
I am currently connected to "3 ITA 3G" and would like to connect to "3 ITA 4G" but tapping on that makes a pop up appear "Registered on network". However no 4G appears in the bar on top. It remains stuck in 3G or H+.
3 ITA doesn't have LTE on band 20 [8oo Mhz LTE].
So why aren't I picking up 4G?

 

[regspy]

@AndrewIT im not in italy, however from Wiki it seems your carrier supports 4G on band 3 (1800).

select the "3 ITA 4G", then follow my steps. You have to scroll up that list in screenshot http://imgur.com/BELHKaO and you'll see "LTE only" and "LTE/WCDMA" option.

 

[AndrewIT]

@AndrewIT im not in italy, however from Wiki it seems your carrier supports 4G on band 3 (1800).

select the "3 ITA 4G", then follow my steps. You have to scroll up that list in screenshot http://imgur.com/BELHKaO and you'll see "LTE only" and "LTE/WCDMA" option.

Thank you! I was finally able to see the 4G icon on my Mi4c.

Entered *#*#4636#*#* in the diapad.
Selected phone information 1 (there are two sims so select the first one)

I scrolled up [see screenshot] and set WCDMA and LTE from the list.

Screenshot: http://imgur.com/OJ98uQi
You can see that I successfully picked up 4G signal, but it was extremely poor, only one bar standing close to a window.
As I move inside the house it loses 4G and gets back to 3G or H+.

It seems that I'm way too far from the LTE antenna to get a good 4G signal.

 

[davo233]

Guys I am kinda lost here, so is there a good chance that it supports especially 800Mhz band or not ? And when I am here, is there hardware difference between TDD-LTE and FDD-LTE version? How do I find out which one I have ?