4G / LTE connectivity on SIM1 - Xiaomi Redmi Note 3 Questions & Answers

Hello,
Are there any users with Redmi note 3 Pro / Snapdragon version that have issues like no 4G or LTE connectivity while using sim1?
this has worked for me when I first bought the phone.
I unlocked the bootloader - unofficial version, installed twrp, tried to flash a rom, bricked my deice, than I managed to flash 7.2.3 global stable official rom - my bootloader was relocked, but sim1 could no more connect on 4g network.
while searching for it manually I can see it, but when i click it to connect, it just registers on 3g network.
since than I have tried to reset the device, full erase, no luck.
I installed global developer rom - with locked bootloader - no luck
I received a code to unlock bootloader, i Unlocked it, but still no 4g connection on sim1.
Any idea what could be wrong?
P.S.
If I put the same SIM in slot 2, 4g connects with no issues, but I want to use that slot for the Microsd card.

---

And I kind of found the culprit.
The phone that is sold in many countries comes with customized miui 7.1.9.0.0 (note the extra 0) and on this rom version 4g works on sim 1, on global versions it does not.
And now I am searching for a customized rom that can't be found anywhere.

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Well I had the same version 7.1.9.0.0 (the unofficial multilanguage) when I got the phone, but I have not activated the 4G on my providers. In the mean time this rom had many issues (didn't recognise the second sim etc) so I flashed with EDL and MiFlash the original Global rom (7.1.7.0) and was ΟΤΑ updated to 7.1.8.0 . Since then I have no 4g on SIM1 but it works fine in slot2
I then got permission to unlock bootloader and unlocked it by flashing the official Chinese Dev 6.3.31.
Someone on the official site reported that the baseband of the AOSP and/or 7.1.7.0 solves the problem if you flash it manually via fastboot... I tried all the following basebands but no luck either.
- AOSP rom baseband (A.2.0.c1.1-00005-8976_GEN-PACK-1)
- Stable 7.1.7.0 rom baseband (A.2.0.c1.1-00019-8976_GEN-PACK-1)
- Stable 7.2.2.0 / 7.2.3.0 rom baseband (1-00019-8976_GEN_PAC K-1.49420.2 .)
Now I have the Greek Stable 7.2.2.0 (based in the Chinese Stable and made by the official fan site in Greece Xiaomi-Hellas) and yet no 4G.
It has been reported as a bug on the official site and as they say the developers are looking to solve it within the next updates..

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Hi Project_P we meet again! heh
OP: if you don't need dual sim, try adding a dummy sim on slot 1 and turn it off and keep your normal sim in slot 2. That fixed the issue for me (obviously not ideal if you need dual sim OR if you need to expand storage).

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hacktek said:
Hi Project_P we meet again! heh
OP: if you don't need dual sim, try adding a dummy sim on slot 1 and turn it off and keep your normal sim in slot 2. That fixed the issue for me (obviously not ideal if you need dual sim OR if you need to expand storage).
Click to expand...
Click to collapse
That is the trick, I want to be able to use the microsd slot also. I am thinking of stripping a sim card and glue it to a microsd card as per the many tutorials out there.

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Have you tried changing the cellular network type to "LTE" or similar?
I managed to regain 4g by doing this

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xstrifey said:
Have you tried changing the cellular network type to "LTE" or similar?
I managed to regain 4g by doing this
Click to expand...
Click to collapse
I have tried to select it manually, but as soon as i click it, it just connects to 3g network.

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There are many people who have this issue on en.miui.com/ thread-265011-1-1.html (correct the link) including me.
I came from a modified ROM 7.1.99.99 by the seller and I flash Miui (7.1.8.0) without unlocking the boatloader. Result: No LTE.
I flash the 6.3.31 the same way. No LTE too.
I set preferred network type to LTE only and no signal.
I've 4g on SIM2 when I've two SIM cards and sometimes on SIM 1. It's not stable

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Hello,
I am French and I also got my phone with the Rom 7.1.9.0.(0) and I also lost 4G on slot 1. Sometimes I can have it on slot 2 by putting a second SIM card slot 2, but it is very unstable and sometimes I lose it also on slot 2. I installed all the Rom that exists but the Chinese / English, but nothing has changed . Even forcing the preferred 4G, I stay in H / H +. It's hopeless, now I think selling it but I will lose money because the 4G does not work.

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Up ! We need some help here

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nonyhaha said:
Hello,
Are there any users with Redmi note 3 Pro / Snapdragon version that have issues like no 4G or LTE connectivity while using sim1?
this has worked for me when I first bought the phone.
I unlocked the bootloader - unofficial version, installed twrp, tried to flash a rom, bricked my deice, than I managed to flash 7.2.3 global stable official rom - my bootloader was relocked, but sim1 could no more connect on 4g network.
while searching for it manually I can see it, but when i click it to connect, it just registers on 3g network.
since than I have tried to reset the device, full erase, no luck.
I installed global developer rom - with locked bootloader - no luck
I received a code to unlock bootloader, i Unlocked it, but still no 4g connection on sim1.
Any idea what could be wrong?
P.S.
If I put the same SIM in slot 2, 4g connects with no issues, but I want to use that slot for the Microsd card.
Click to expand...
Click to collapse
Same problems here. Have to try changing to SIM2 slot and will report back. Weird bug.
edit: Better late than never. SIM2 only supports Nano from what I can tell. Couldn't switch since I'm on Micro. Will have to try with another SIM.

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Same issue here. I lost 4g in sim slot 1 somewhere along the way through changing MIUI roms (Official/Dev/China etc) trying to unlock officially.
Until today with SIM1 slot Active, and SD Card inserted - No 4g anywhere.
Today I tried the hardware mod (sticking SIM to SD Card) - I now have 4G!
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This is a method to get 4g working on SIM1 for a while. I got this info from XIaomi forums:
1. Turn off your phone
2. Put two simcard (micro & nano) that support 4G
3. Set data/internet to simcard 2
4. Eject your simcard tray without power off
5. Remove simcard 1 and put only simcard 2
6. Set LTE only on simcard 1 (using *#*#4636#*#* method)(dial that number, click phone information 1 and "Set preferred network type:" to LTE only)
7. Eject your simcard tray, and put simcard 1 again
8. Wait a few minute, if simcard 2 change to H+/3G
9. Switch data/internet to simcard 1
10. And ...... 4G/LTE work again using simcard 1.
11. After this you can eject the tray again without turning the phone off and swap SIM2 with microsd card.

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I have the exact same situation as OP, even living in the same country. The thing is other users on the phone's softpedia section don't have this issue after flashing the 7.2.5.
I was hoping the 7.3.2. OTA would resolve this but there's no change.
My bug report was closed saying an update will come: http://en.miui.com/thread-280981-1-1.html.
Edit: I don't have a 2nd SIM to try that, nano-SIM too.

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In_a_state said:
I have the exact same situation as OP, even living in the same country. The thing is other users on the phone's softpedia section don't have this issue after flashing the 7.2.5.
I was hoping the 7.3.2. OTA would resolve this but there's no change.
My bug report was closed saying an update will come: http://en.miui.com/thread-280981-1-1.html.
Edit: I don't have a 2nd SIM to try that, nano-SIM too.
Click to expand...
Click to collapse
Whenever you can do the truck, do it. I also got the update to 7.3.2.0, but it is now back on 3g. I will do the mod again now.

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A few have reported that a factory reset solved some issues.
http://en.miui.com/forum.php?mod=viewthread&tid=279121

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In_a_state said:
I have the exact same situation as OP, even living in the same country. The thing is other users on the phone's softpedia section don't have this issue after flashing the 7.2.5.
I was hoping the 7.3.2. OTA would resolve this but there's no change.
My bug report was closed saying an update will come.
Edit: I don't have a 2nd SIM to try that, nano-SIM too.
Click to expand...
Click to collapse
I have the same issue with my handset too. even after update to 7.3.
Today I tested with only nano sim in slot 2 & it started finding 4G signals.
But slot 1 still work only for 2G & 3G

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Hello,
I will repeat myself once, but I can confirm that if you received your phone with the Rom 7.1.9.0.0 dealer, it is because of her that we lost 4G on slot 1.
I really tried everything, even change the line build.prop but nothing has changed, still no 4G on slot 1.
Maybe if Xiaomi is an update of the Baseband, we can recover but this is not certain.

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rudyjo said:
Hello,
I will repeat myself once, but I can confirm that if you received your phone with the Rom 7.1.9.0.0 dealer, it is because of her that we lost 4G on slot 1.
I really tried everything, even change the line build.prop but nothing has changed, still no 4G on slot 1.
Maybe if Xiaomi is an update of the Baseband, we can recover but this is not certain.
Click to expand...
Click to collapse
I know that, but still, it should work normal with international rom, because it uses the same modem as all redmi note 3 snapdragons out there.

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Basically, Redmi Note 3 comes in 3 versions, two Chinese ones (One with MTK and one with SD650) and Global one(SD650). The Global version is the one that is sold in India, Taiwan, Singapore and part of Europe. The Chinese SD650 version, mostly sold in China, says it supports more bands than the Global one.
Chinese SD650 version LTE bands:
B1/B2/B3/B4/B5/B7/B8
B38/B39/B40/B41(2555-2655MHz)
Global Sd650 version LTE bands:
B1/B3/B5/B7/B8
B38/B39/B40/B41(2555-2655MHz）
I bought the Chinese one as I need to have Band 4 to work with my USA carrier. It worked when i was in China, but same unfortunate thing happens the me when I came back to the States and wiped my phone to dev. I can't access 4g band 4 on Sim 1, 3g connection is bad on Sim1 too. Sim 2 works fine for two days and then the 4g downgrades to 3g and then 3g connection is on and off.