5G problems on Sim 1 - Samsung Galaxy S21 Questions

I have the S21+ dual sim version (so Samsung chipset) with two sims from Vodafone.
Whenever Sim 1 sees a 5g connection and connects and then goes back to 4G, all internet traffice seems to pause as if disconnected from network.
Sim 2 does not seem to show same issue.
Also, Sim2 sees 5G when Sim 1 only sees 4G, but surely they should be the same.
I have read somewhere that the Samsung chipset S21 does suffer from some 5g problems when switching between 45 and 5G then back again.
Does anyone know a fix or advice.
I have tried the recommended reboot and toggling Airplane mode nwhen the 4G seems to lock up, but does not help

Related

Honor 7 - Dual SIM with Dual Data connection 4g/3g

Hi Lads,
I bought an Honor 7 EU, because it was the only one can run two SIM connected to 4G and 3G at the same time also with active data connection. The only limit is that the first SIM must be connected to 4G to allow second SIM linking to 3G networks.
I saw the review on an Italian Blog (by A.Galeazzi on HDBlog) were the phone was on 4G on SIM1, and 3G on SIM2 and was explained also a sort of download boosters which use the two data networks simultaneously.
Unfortunately for me (ut of the box with release b100 and later with updated b121) the phone has always been connected to 2G networks on SIM2.
On a side note, I have a Wind Plan in Italy, that is correctly connecting to 4G Networks, while the second SIM is 3IRL which theoretically should connect to a 3G network Three UK/ITA. Unfortunately the issue is that the second SIM is roaming not on 3 sister Network but in 2G on a different network.
This for me is a big deal because with 3 IRL I have free calls and sms even when roaming (3 Like Home), as long as the phone is connected to a sister network (ergo 3ITA or 3UK). I use 3IRL for work, this means i'm an heavy users, so it is vital that the second SIM is on a sister network (3Italy/3UK) to avoid crazy roaming charges.
By the way, on the SIM 1, I would also like to have the data from Wind Italy in 4G, when staying in Italy, so I can get connected to 4G network in Italy and UK and Ireland.
How can I fix? Anyone out there who can help or point me in the right directon?
Dubliner972 said:
Hi Lads,
I bought an Honor 7 EU, because it was the only one can run two SIM connected to 4G and 3G at the same time also with active data connection. The only limit is that the first SIM must be connected to 4G to allow second SIM linking to 3G networks.
I saw the review on an Italian Blog (by A.Galeazzi on HDBlog) were the phone was on 4G on SIM1, and 3G on SIM2 and was explained also a sort of download boosters which use the two data networks simultaneously.
Unfortunately for me (ut of the box with release b100 and later with updated b121) the phone has always been connected to 2G networks on SIM2.
On a side note, I have a Wind Plan in Italy, that is correctly connecting to 4G Networks, while the second SIM is 3IRL which theoretically should connect to a 3G network Three UK/ITA. Unfortunately the issue is that the second SIM is roaming not on 3 sister Network but in 2G on a different network.
This for me is a big deal because with 3 IRL I have free calls and sms even when roaming (3 Like Home), as long as the phone is connected to a sister network (ergo 3ITA or 3UK). I use 3IRL for work, this means i'm an heavy users, so it is vital that the second SIM is on a sister network (3Italy/3UK) to avoid crazy roaming charges.
By the way, on the SIM 1, I would also like to have the data from Wind Italy in 4G, when staying in Italy, so I can get connected to 4G network in Italy and UK and Ireland.
How can I fix? Anyone out there who can help or point me in the right directon?
Click to expand...
Click to collapse
Have you found a solution ? I have two 3UK sim cards and can't use them both, have to switch between them. Please let me know, thanks!
Dubliner972 said:
Hi Lads,
I bought an Honor 7 EU, because it was the only one can run two SIM connected to 4G and 3G at the same time also with active data connection. The only limit is that the first SIM must be connected to 4G to allow second SIM linking to 3G networks.
Click to expand...
Click to collapse
Are you sure this is the case? As far as a I knew the Honor 7 EU can run one SIM on 3G/4G and the other on 2G only when both SIM's are in the phone at the same time. It's the Chinese version which allows 3G/4g on both SIM's at once (and has 64GB internal storage). I could be wrong but I'm sure someone else can clarify.
GrandMasterPlank said:
Are you sure this is the case? As far as a I knew the Honor 7 EU can run one SIM on 3G/4G and the other on 2G only when both SIM's are in the phone at the same time. It's the Chinese version which allows 3G/4g on both SIM's at once (and has 64GB internal storage). I could be wrong but I'm sure someone else can clarify.
Click to expand...
Click to collapse
never had two sim in my eu honor, but only one sim can do 4g, and the other i think it is 3g and not 2g
correct me i am wrong
Any updates on this? Can any phone actually run 3G/4G or at least 3G/3G at the same time? (or full autoswitch on call to 3G?)
I'm interested in the voice part only, for both cards to be 3G, without having to manually switch. 4G/3G would be a bonus
GrandMasterPlank said:
Are you sure this is the case? As far as a I knew the Honor 7 EU can run one SIM on 3G/4G and the other on 2G only when both SIM's are in the phone at the same time. It's the Chinese version which allows 3G/4g on both SIM's at once (and has 64GB internal storage). I could be wrong but I'm sure someone else can clarify.
Click to expand...
Click to collapse
how tell you Chinese version allows 3G/4g on both SIM's at once ( I have 64GB internal storage ) this not correct. the chinese version the same EU version not diffecult .
I have this problem. SIM1 connected 4G, SIM2 can only use 2G. Phone was bought in Beijing. Settings allow you to make either one of them but not both triband.
Second SIM is not connecting properly unless i switch the setting to allow SIM2 slot to be triband enabled. Then i get on, but the SIM1 becomes useless for data.

Dual SIM card CM13 vs LOS14

Hi,
I've got a question about using 2 SIM cards.
With the Redmi Note 3 Pro (Kenzo) I have read it was possible to use 2 SIM card but one would be connected to 3G/LTE while the 2nd card would only be connected to 2G. It's not possible to connect both of them on 3G/LTE at the same time. That's exactly what I experienced in the past and I was fine with it.
Right now in my phone I have 2 SIM cards :
SIM1 : Bell Canada (Voice + Data LTE) provided by work. Bell shut down their 2G network a while ago.
SIM2 : Fido (Data LTE only) for personnal use. Fido, owned by Rogers, still has Edge / 2G network.
When I was still on CM13, if I selected my Fido SIM card for my the data connection, I would instantly loose the signal on the Bell SIM card because Bell has no 2G network anymore. It was fine for me that way, it meant I wouldn't receive work related call while I'm not at work (we have a dedicated after hours service and I'm not part of it...) If I selected my Bell SIM card for data, my Fido SIM card would stay connected because Fido/Rogers still have a 2G network.
Today I installed Lineage OS 14.1. Something unexpected happens, if I enable my Fido SIM card, I can see the LTE icon for the Fido SIM but I also keep the connection to the Bell network.
Was the fact that both SIM card couldn't connect to 3G/LTE at the same time a limitation that was lifted in Lineage OS 14.1 ?
Thanks

Can't connect to LTE only WCDMA

My Z5C E5823 wont connect or get any LTE network, only H+ at most.
I'm on Telstra network, other sim doesnt work too. But works just fine if I popped it to my Mi Max 2.
I can see both LTE and 3G network if I have to manually search for network operator, but selecting LTE network will produce similar result.
Downloaded the appropriate APN settings, same.
Tried to set LTE as preferred network type, same.
No data, no signal on LTE mode.
I don't know much about the history of this phone, got this from an acquaintance who also has this issue from the moment he got it.
Android 7.1.1 (32.4.A.1.54)
Baseband Version: 8994-FAAAANAZQ-00065-37
Unrooted
Bootloader Locked
the same thing happens to me and with the same baseband

Device not falling back to 3G from 4G

Hi,
I have a Lenovo vibe k6 note stock rom on Android 7.0.
Calls are working perfectly in Jio 4G (volte).
Recently I switched to Vodafone 4G (no volte).
When I try to place calls, the device is not falling back to 3G. I am unable to switch the network to 3G or 2G manually also. However 2G works when I change my primary data Sim.
I tried swapping the sim slots, toggling enhanced 4G services, restoring the device software, changing sim cards, replacing my sim card, the same problem persists.
I am using this sim with Lumia 640 XL LTE now. This issue is not present with other phones.
Any help would be appreciated.

Question Major issues BC72 canada

Wondering if anyone else has network issues with their BC72 in Canada. I'm on the fido network which means no 5g.
The phone works absolutely fine on wifi, but throw in a sim card and the problems are as follows:
Phone randomly freezes with the screen off, needing a manual reboot.
Camera fails to start half the time
Calls drop, texts fail to send
Apps take ages to open or freeze during use
All of this is intermittent so it can work fine for hours then become basically unusable.
I know this is the Chinese version so I'm wondering if flashing the ROM would help? Thanks in advance
dajee said:
Wondering if anyone else has network issues with their BC72 in Canada. I'm on the fido network which means no 5g.
The phone works absolutely fine on wifi, but throw in a sim card and the problems are as follows:
Phone randomly freezes with the screen off, needing a manual reboot.
Camera fails to start half the time
Calls drop, texts fail to send
Apps take ages to open or freeze during use
All of this is intermittent so it can work fine for hours then become basically unusable.
I know this is the Chinese version so I'm wondering if flashing the ROM would help? Thanks in advance
Click to expand...
Click to collapse
What bands does Fido use?? Also sounds like a faulty phone tbh...mind you I'm in the US with the same device
Ainz_Ooal_Gown said:
What bands does Fido use?? Also sounds like a faulty phone tbh...mind you I'm in the US with the same device
Click to expand...
Click to collapse
according to the fido forums
GSM ~ EDGE (2G) ~ on band 5 (850MHz).
UMTS or WCDMA ~ HSPA (3G) / HSPA+ (4G) ~ on band 5 (850 MHz).
To access LTE, the device must be compatible with one or more of the following:
700 MHz on Band 12;
850MHz on Band 5;
1900 MHz on Band 2, Band 25;
1700/2100 MHz on Band 4, Band 66;
2600 MHz on Band 7.
Fido doesn't offer 5G
I’ve been using this phone in Canada for years but I don’t have these issues. The CN firmware has different Google services including the phone and text app and also the camera app. Also it’s always trying to connect to servers in China but it’s extremely slo in Canada. You can flash a TW firmware and I’ll be good. Flashing stock firmware doesn’t require root or unlocking. Also I was with Fido before and the LTE bands seemed okay since I never experienced a signal issue.

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