Does Redmi note 9s support carrier aggregation? - Redmi Note 9S / Note 9 Pro (Indian Model) Question

Hi,
Bought a Redmi note 9s and works fine but I noticed when connecting to LTE/4G it just shows 4G and not 4G+.
My Redmi Note 8 Pro shows 4G+ just fine with the same sim card but Note 9s doesn't.
I tested the speed on Note 8 Pro it gives ~150Mbps but on Note 9S just around 50-60Mbps which means carrier aggregation is not working.
When I checked snapdragon 720G specs I found it supports carrier aggregation.
Is it a bug on MIUI 11 or it's disabled by Xiaomi?
Any idea?

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The_wolf88 said:
Hi,
Bought a Redmi note 9s and works fine but I noticed when connecting to LTE/4G it just shows 4G and not 4G+.
My Redmi Note 8 Pro shows 4G+ just fine with the same sim card but Note 9s doesn't.
I tested the speed on Note 8 Pro it gives ~150Mbps but on Note 9S just around 50-60Mbps which means carrier aggregation is not working.
When I checked snapdragon 720G specs I found it supports carrier aggregation.
Is it a bug on MIUI 11 or it's disabled by Xiaomi?
Any idea?
Click to expand...
Click to collapse
Yes my Redmi Note 9S Global seems to support carrier aggregation (4G+)

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I have here supported 4G Combinations: https://cacombos.com/device?model=M2003J6A1G . This device support only intra-band CA - so this is maybe reason why you don't get 4G+.
Note 8 Pro https://cacombos.com/device?model=M1906G7G support 1+3 so that i think your network use?
To improve database you can send to me modem log from your device. Here is instruction: https://mt-tech.fi/en/how-to-get-4g...phone/#Method_for_Qualcomm_Devices_after_2020 - you can send log file to: https://cacombos.com/contribute .

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galaxy6220 said:
Yes my Redmi Note 9S Global seems to support carrier aggregation (4G+)
Click to expand...
Click to collapse
Very strange, which miui version installed on your phone?

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olkitu said:
I have here supported 4G Combinations: https://cacombos.com/device?model=M2003J6A1G . This device support only intra-band CA - so this is maybe reason why you don't get 4G+.
Note 8 Pro https://cacombos.com/device?model=M1906G7G support 1+3 so that i think your network use?
To improve database you can send to me modem log from your device. Here is instruction: https://mt-tech.fi/en/how-to-get-4g...phone/#Method_for_Qualcomm_Devices_after_2020 - you can send log file to: https://cacombos.com/contribute .
Click to expand...
Click to collapse
I need check my carrier what bands are used for CA.
I'll update once I get a reply from them.

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The_wolf88 said:
Very strange, which miui version installed on your phone?
Click to expand...
Click to collapse
Miui 11.0.8. 4G+ was working out of the box, even using version 11.0.7 . My carrier is EE in the UK.

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galaxy6220 said:
Miui 11.0.8. 4G+ was working out of the box, even using version 11.0.7 . My carrier is EE in the UK.
Click to expand...
Click to collapse
Screenshot not showing 4G+ was on wifi at the time Sorry couldn't delete/replace that. Just to show my Miui version.

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galaxy6220 said:
Screenshot not showing 4G+ was on wifi at the time Sorry couldn't delete/replace that. Just to show my Miui version.
Click to expand...
Click to collapse
Same version I have.
Wifi calling is working also? anything special you did to get wifi calling working? I didn't work for me

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galaxy6220 said:
Miui 11.0.8. 4G+ was working out of the box, even using version 11.0.7 . My carrier is EE in the UK.
Click to expand...
Click to collapse
EE UK use Contiguous CA B3+B3 (3C) and B7+B7 (7C) so that's why you see 4G+. Not every network do contiguous CA so then they doesn't see 4G+ icon.
---------- Post added at 03:22 PM ---------- Previous post was at 03:14 PM ----------
The_wolf88 said:
Same version I have.
Wifi calling is working also? anything special you did to get wifi calling working? I didn't work for me
Click to expand...
Click to collapse
Need providers configuration to get VoWIFI working properly. Your provider and Xiaomi have to work together to bring VoWIFI and VoLTE services to this device.

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The_wolf88 said:
Same version I have.
Wifi calling is working also? anything special you did to get wifi calling working? I didn't work for me
Click to expand...
Click to collapse
No I just enabled wifi calling in the Sim Card & Mobile network settings. I set the option below that to favour wifi calling, so that icon always appears whenever I'm in range of my router. I have never asked EE for voWiFi or VoLTE permissions.
Just to mention too, on my previous Redmi Note phones I used to have to mess around deep to get VoLTE working but this option worked straight out of the box for my 9S. Hope you manage to sort it.

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olkitu said:
EE UK use Contiguous CA B3+B3 (3C) and B7+B7 (7C) so that's why you see 4G+. Not every network do contiguous CA so then they doesn't see 4G+ icon.
---------- Post added at 03:22 PM ---------- Previous post was at 03:14 PM ----------
Need providers configuration to get VoWIFI working properly. Your provider and Xiaomi have to work together to bring VoWIFI and VoLTE services to this device.
Click to expand...
Click to collapse
My carrier is doing the same, when I asked them they said we use B3+B3 (1800MHz) for CA. It's strange why it's not working for me.
There is no way my provider will support Xiaomi at least for now because in my country Samsung/Huawei are the majority and those are supported.
Samsung has both VoLTE and VoWifi, Huawei only VoLTE.
For me to get VoLTE for Xiaomi I just disable carrier check by code *#*#86583#*#* in my phone and add IMS apn settings and it connects to VoLTE.
galaxy6220 said:
No I just enabled wifi calling in the Sim Card & Mobile network settings. I set the option below that to favour wifi calling, so that icon always appears whenever I'm in range of my router. I have never asked EE for voWiFi or VoLTE permissions.
Just to mention too, on my previous Redmi Note phones I used to have to mess around deep to get VoLTE working but this option worked straight out of the box for my 9S. Hope you manage to sort it.
Click to expand...
Click to collapse
VoLTE is working with code *#*#86583#*#* and add IMS apn, but it seems for VoWifi carrier has to add those settings in their network.

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The_wolf88 said:
My carrier is doing the same, when I asked them they said we use B3+B3 (1800MHz) for CA. It's strange why it's not working for me.
There is no way my provider will support Xiaomi at least for now because in my country Samsung/Huawei are the majority and those are supported.
Samsung has both VoLTE and VoWifi, Huawei only VoLTE.
For me to get VoLTE for Xiaomi I just disable carrier check by code *#*#86583#*#* in my phone and add IMS apn settings and it connects to VoLTE.
VoLTE is working with code *#*#86583#*#* and add IMS apn, but it seems for VoWifi carrier has to add those settings in their network.
Click to expand...
Click to collapse
What ia your operator? Maybe they do 3A-3A not 3C. That is reason why no 4G+ enabled.

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I also have the question if RN 9S and/or RN 9 Pro support the same or more then RN 7 regarding LTE Bands and CA specifically for IT provider TIM.
RN 7 is LTE Cat 9 450/50 with interesting Bands 1/3/7/20? (no 32) and should support 2CA 3-1 (no 7-3).
RN 9s LTE Cat 12 600/150 with interesting Bands 1/3/7/20? (no 32) and no reported support of 2CA 3-1 or 7-3.
RN 9 Pro LTE Cat 12 600/150 with interesting Bands 1/3/7/20? (no 32) and reported support of 2CA 3-1 + 7-3.
Regarding Bands deviceranks.com has: RN7 no 3/20, RN9s no 20, RN9Pro no 20. cacombos.com reports: RN7 Global has 3/20 (LTE 400/150), RN9s Global has 20, RN9Pro has 20.
Regarding CA cacombos.com reports: RN7 has 2CA 3-1 (no 7-3), RN9s has no (reported) 2CA, RN9Pro Global has 2CA 3-1, 7-3
So there are a lot of unclear listings probably also by not showing if Global model or not.
I wonder if there is a difference in those specs between 9s and 9 Pro, the 2CA support seems decisive to me, especially when 9s does not support any 2CA.

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ChriMo said:
I also have the question if RN 9S and/or RN 9 Pro support the same or more then RN 7 regarding LTE Bands and CA specifically for IT provider TIM.
RN 7 is LTE Cat 9 450/50 with interesting Bands 1/3/7/20? (no 32) and should support 2CA 3-1 (no 7-3).
RN 9s LTE Cat 12 600/150 with interesting Bands 1/3/7/20? (no 32) and no reported support of 2CA 3-1 or 7-3.
RN 9 Pro LTE Cat 12 600/150 with interesting Bands 1/3/7/20? (no 32) and reported support of 2CA 3-1 + 7-3.
Regarding Bands deviceranks.com has: RN7 no 3/20, RN9s no 20, RN9Pro no 20. cacombos.com reports: RN7 Global has 3/20 (LTE 400/150), RN9s Global has 20, RN9Pro has 20.
Regarding CA cacombos.com reports: RN7 has 2CA 3-1 (no 7-3), RN9s has no (reported) 2CA, RN9Pro Global has 2CA 3-1, 7-3
So there are a lot of unclear listings probably also by not showing if Global model or not.
I wonder if there is a difference in those specs between 9s and 9 Pro, the 2CA support seems decisive to me, especially when 9s does not support any 2CA.
Click to expand...
Click to collapse
I have here listed CA combinations of devices:
Redmi Note 7: https://cacombos.com/device?model=M1901F7G (CAT13)
Redmi Note 9s: https://cacombos.com/device?model=M2003J6A1G (CAT13)
Redmi Note 9 Pro: https://cacombos.com/device?model=M2003J6B2G (CAT12)

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I'm from Malaysia using operator Digi https://en.m.wikipedia.org/wiki/Digi_Telecommunications
Same situation as OP, just 4G no 4G+
Can't even toggle VoLTE provision in phone information(attached pic)
BTW how to check which operator supports VoLTE for RN9S?