Database Info

Dual sim, one sim always 2G

Hello all,
I'm a dual sim user for some time now.
Currently I'm looking for a replacement for my Allview P5Quad (rebrand of Gionee gn708w, same as Xolo Q800), which slowly but steadily gets to the end of it's usable life.
I'm currently looking at another dual-sim, the Gionee Marathon M5 (rebranded as Allview P8 Energy in Romania).
BUT I see that after all this time the operating of dual-sim devices like these is still the same. One Sim set as available for 3g(or 4g if available) and the other one locked on 2g only.
This was not a big concern until now, but in my country 4g rollout is quite fast, 3g gets better AND due to this lately 2g is becoming more and more ****ty and unusable even for voice only, due to being discretely phased out.
Is there a dual sim phone that would support a combination of sims like 4g+3g or at least 3g+3g, or even better (dreaming) 4g+4g?
Is this limitation hw or sw?
Afaik it is a hw design limit in the chipset. If so, anybody has any idea on why do manufacturers stick to this way when 2g is going out and 3g and 4g are so present in our lives?
Thanks.
Sent from my P5_Quad using Tapatalk

Xperia XA Dual SIM with EU version?

Dear community,
I've got a question related to the Sony Xperia XA which is sold in germany.
The version has a single SIM Tray. Looking at the tecspecs, i can see, there also is a dual SIM version.
So my question ist: Does anyone knows, if this is a different smartphone, so that the hardware of the single SIM version is not able to handle double sim?
Or is it just the sim tray, which is single SIM in germany?
It's the model no F311, if it helps.
I'm asking this, because i can buy a dual SIM tray for less money. I'm not allowed to post the link, but you can find it on parts4repair dot com.
If it's also just a software thing, i can use another rom which can handle dual sim.
Would be happy to hear about your experience so far.
Greetings,
Cyberrob

You can find 5 models of the XA: F3111, F3113 and F3115 with single sim, F3112 and F3116 with dual sim. Others hardware specs are same for all, only radio bands are differents. If you want dual sim XA for Germany you have to buy the F3112, I'm from France and have it (from the Sony Store). To be sure verify the network bands used by your provider.

That's a really good answer, tank you so much.
So i do know now, it's impossible with my F3111.
Had no other option, because it's from a contract extension, or how it is called in english.

Intl. vs other markets, Dual Sim vs Single sim

Hi all,
There does not seem to be any resource that clearly shows the variations of the U Ultra at present.
I personally have a TW market model, with dual SIM. It appears that the bands on this model are not right for North America (and perhaps also South America) but are fine for my uses in APAC.
Given that there is limited info, perhaps we should gather some information.
Mine: 1.09.709.7 Taiwan model, Dual SIM
I am located in Australia, and Australia launches on March 8. It is unclear to me which model, though the product page on HTC's AU site suggest it would be single sim.
Can others who have gotten an U Ultra in other markets comment on their version? UK / India / NA?
Reason why I've put this in this subforum is so that we can explore the possibilities of opening up hidden bands with different radios (I believe my Taiwan Model supports: FDD: B1/B3/B5/B7/B8/B20/B28 TDD: B38/B39/B40/B41) and the AU model lists FDD: Bands B1/B2/B3/B4/B5/B7/B8/B12/B17/B20/B28TDD: Bands B38/B39/B40/B41 - which is in line with US?
Also, it may allow single sim to potentially support dual sim? as the dual sim has a combo slot with microsd, perhaps the hardware is there for single sim to support a second sim.
Lets explore what we can do with this phone!

Hi, seems like you posted on the wrong section. Maybe a moderator could move it to "HTC U ULTRA GUIDES, NEWS, & DISCUSSION" ?

Howling Wolf said:
Hi, seems like you posted on the wrong section. Maybe a moderator could move it to "HTC U ULTRA GUIDES, NEWS, & DISCUSSION" ?
Click to expand...
Click to collapse
Hey Wolf, you're probably right, a mod prob should move this. I originally intended this to form a basis where we can collect all the different firmware / radios etc, as I was under the impression that there were multiple hardware variations worldwide....
In one of the threads here on XDA, another member suggested he ordered the intl. model and it didnt support the right bands for the USA. Leading me to think there were multiple models.
I'm starting to think there isn't, here is why.
1. Michael Fisher (I think he's in Canada) imported a TW market phone for his early review. It appears to have LTE in the film, and he doesnt mention anything about incompatibilities.
https://www.youtube.com/watch?v=WIWbn8ecKwA
2. Jeff Springer (I think he's in the USA) imported a HK market phone, it also appears to have LTE - https://www.youtube.com/watch?v=fclOYUyfxnE&t=522s
I believe the belief that the intl. model doesnt support USA bands (2/4, etc) comes from the practice (poor practice, admittedly) for HTC's Taiwanese website to only declare the bands that it perceives are relevant to Taiwanese users. The HK website suggests the same as taiwan = FDD: B1/B3/B5/B7/B8/B20/B28 TDD: B38/B39/B40/B41
The UK / India / USA / AU sites all state - FDD: Bands B1/B2/B3/B4/B5/B7/B8/B12/B17/B20/B28TDD: Bands B38/B39/B40/B41
With USA & AU not stating support for dual sim, but HK, TW, India, UK do.
I believe there is only one model (with multiple software variations), and the information published being variable.

@sephstyler. I was thinking the same. ?

profixit said:
@sephstyler. I was thinking the same.
Click to expand...
Click to collapse
HTC U Ultra through Vodafone Australia does not support dual sim out of the box. The example I saw today was running 1.09.710.12

I purchased one off of an eBay from a Chinese vendor; I'm pretty sure it's the international version since it has the dual sim and int'l charger. I can confirm no problems here in NY and I'm on T-Mobile.

akhobbes said:
I purchased one off of an eBay from a Chinese vendor; I'm pretty sure it's the international version since it has the dual sim and int'l charger. I can confirm no problems here in NY and I'm on T-Mobile.
Click to expand...
Click to collapse
That's pretty good news.
Can you confirm the model number of yours (On box, printed on the back of the handset in feint print) - I'm assuming this is a "U-1u"
If you can also let us know the version number of your firmware - Settings, About, and then Software Info. If you got an Intl' charger it might be China or Hong Kong stock (Taiwan uses the same plugs as US).
So the Hong Kong (and Taiwan) version states: FDD：B1/B3/B5/B7/B8/B20/B28 TDD：B38/B39/B40/B41, and T-Mo in the USA uses B2 / B4 and B12. So its obvious that the support does exist, just simply not denoted appropriately on the website.
Great news.

Question - are those phones, that are/are not Dual SIM supporters, different in Hardware or just software manipulated limitations? I am asking this as my phones doe not recognize second SIM, but if I were to flash it with unlocked software for dual SIM, would it work? Thank you!

[email protected] said:
Question - are those phones, that are/are not Dual SIM supporters, different in Hardware or just software manipulated limitations? I am asking this as my phones doe not recognize second SIM, but if I were to flash it with unlocked software for dual SIM, would it work? Thank you!
Click to expand...
Click to collapse
I'm not sure about that, but I tried 2 ROMs which supported dual SIM, and those weren't able to use the 2nd SIM/sd slot.. not sure about any customizations inside the rom/kernel/whatever though

OK I understand that, still, I am wondering if there are actual hardware limitations for the dual sim or just software, never mind the ROM...

I have buy my phone yesterday and it is a Single SIM phone for EU market (Made In Taiwan) and with productID number finishing with ...100. Dual SIM phones ID finishing with ...200.
I put my sim card to second (mSD/nSIM) slot and i when i turn on phone i have 2 sim cards drawed onphone (one empty and another (absent sim) with a full signal but crossed mark...
Hmmm, sims like have second SIM card software blocked ?

The same thing is happening on my Single SIM (EU) phone. If I insert the second SIM into the 2nd SIM slot, the phone recognizes it and displays a full signal bar with a crossed mark. Obviously, the hardware is capable of handling the second SIM (otherwise it would not be detected at all), but it's crippled in software. So far I did not find a way to unlock Dual SIM support.

Did anyone of you guys try flashing a rom with dual SIM support?

Hi i found main difference between Single Sim and Dual Sim HTC U Ultra :
NETWORK3
2G/2.5G GSM/GPRS/EDGE
Single SIM
850/900/1800/1900 MHz
Dual SIM
850/900/1800/1900 MHz
3G UMTS
Single SIM
AWS/850/900/1900/2100 MHz
HSDPA 42, HSUPA 5.76
Dual SIM
850/900/1900/2100 MHz
HSDPA 42, HSUPA 5.76
4G LTE™ (up to 600Mbps)
Single SIM
FDD: Bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 28
TDD: Bands 38, 39, 40, 41 with 2CA, 3CA
Support Cat 11 LTE: downloads up to 600Mbps, uploads up to 50Mbps
VoLTE and WiFi calling
Dual SIM
FDD: Bands 1, 3, 5, 7, 8, 20, 28
TDD: Bands 38, 39, 40, 41 with 2CA, 3CA
Support Cat 11 LTE: downloads up to 600Mbps, uploads up to 50Mbps
VoLTE and WiFi calling
It appears that Single Sim is made to work with AWS. >>>>> AWS is used in the United States, Argentina, Canada, Colombia, Mexico, Chile, Paraguay, Peru, Ecuador and Uruguay.
and supports more bands then Dual sim one. I think flashing dual sim softwer version will change nothing since you still wont be able to use 2 sim cards.

I was mislead from some reviews, including gsmarena, that said HTC Ultra only had a dual sim version and I bought the phone. Unfortunately it doesn't support the 2nd sim. In my case it doesn't even have any icon crossed... I wonder why does it have the place holder for a second sim...
Anyone was successeful in accessing the 2nd sim on a single sim version? (model number ending in "100")

Actually I've also tried a bit to get dual SIM to work on my single SIM device, but flashing dual SIM activated ROMs wasn't enough and I've no idea what I could try now.
Maybe ask one of the ROM developer's?

Guys i dont think it is possible since as i posted above it is in some way different device. Same as you cant enable more bands support on dual sim version by software.
Sent from my Mi Note 3 using Tapatalk

Which Custom Rom support dual VOLTE standby support?

I am using Oneplus 3, I have 2 Jio sim. but one sim have network coverage at a time. Same thing i do it in nokia 6.1 plus mobile. which mobile support dual volte. that is both sim have network coverage at a time. Whether the oneplus 3 support dual volte standby option or not? and whether this support can provide by software level?
If there is any rom having this dual volte standby support for oneplus 3 , Let me share that rom link.

thiru17413 said:
I am using Oneplus 3, I have 2 Jio sim. but one sim have network coverage at a time. Same thing i do it in nokia 6.1 plus mobile. which mobile support dual volte. that is both sim have network coverage at a time. Whether the oneplus 3 support dual volte standby option or not? and whether this support can provide by software level?
If there is any rom having this dual volte standby support for oneplus 3 , Let me share that rom link.
Click to expand...
Click to collapse
Sorry to say but the Dual VoLTE is a feature that needs to be supported by the SoC. It's not something that you can get via just Software. The newer Snapdragon chips support Dual VoLTE but the 820/821 do not. Even the 835 do not support it, while the 845 & some other newer SoC's do.
So, in layman terms, OP3/33T do not support Dual VoLTE & never will.
Sent from my #FlagshipKiller3T using Tapatalk

Very very wrong place to post this thread

DarkSJ1998 said:
Sorry to say but the Dual VoLTE is a feature that needs to be supported by the SoC. It's not something that you can get via just Software. The newer Snapdragon chips support Dual VoLTE but the 820/821 do not. Even the 835 do not support it, while the 845 & some other newer SoC's do.
So, in layman terms, OP3/33T do not support Dual VoLTE & never will.
Click to expand...
Click to collapse
i think Nokia 6.1 plus have 635 chipset. which have that support. that's why i am confused. Anyhow thanks for your response :fingers-crossed:

thiru17413 said:
i think Nokia 6.1 plus have 635 chipset. which have that support. that's why i am confused. Anyhow thanks for your response :fingers-crossed:
Click to expand...
Click to collapse
Since we are already off-topic here, I am curious to know, why do you think OnePlus 3 will have that support too if 6.1 has that? 820 and 635 are two completely different SoCs so I don't understand how would you relate one to the other?

S*rew dual VoLTE, this phone called OnePlus 3 doesn't support even dual 4G. One sim connects to 4G, another one to 3/2G. So this is an impossible claim.

qhsusb_bulk said:
S*rew dual VoLTE, this phone called OnePlus 3 doesn't support even dual 4G. One sim connects to 4G, another one to 3/2G. So this is an impossible claim.
Click to expand...
Click to collapse
Actually our phone/SoC doesn't even support active-active, only active-passive mode as the modem doesn't have multiple lines/channels. That's why you can't surf when you get a phone call over 3G when phone is in 4G-mode, as it can't downgrade data-stream down to 3G while phone call is active.
Skickat från min ONEPLUS A3003 via Tapatalk

thiru17413 said:
I am using Oneplus 3, I have 2 Jio sim. but one sim have network coverage at a time. Same thing i do it in nokia 6.1 plus mobile. which mobile support dual volte. that is both sim have network coverage at a time. Whether the oneplus 3 support dual volte standby option or not? and whether this support can provide by software level?
If there is any rom having this dual volte standby support for oneplus 3 , Let me share that rom link.
Click to expand...
Click to collapse
Oneplus 3 have dual 4G stand-by and not dual-active mode. That means both slots can support 4G when you make it the primary data sim. Dual-Active phones can have two 4G networks active at the same time. Nokia 6.1 plus probably have dual-active support due to being newer chipset. And yes it cannnot be added via software update.

srpengg said:
Oneplus 3 have dual 4G stand-by and not dual-active mode. That means both slots can support 4G when you make it the primary data sim. Dual-Active phones can have two 4G networks active at the same time. Nokia 6.1 plus probably have dual-active support due to being newer chipset. And yes it cannnot be added via software update.
Click to expand...
Click to collapse
Thanks or your response dude

Is it true when you enable 5G you lose dual sim functionality?

I just heard it from one of the reviewers and I needed to confirm it from one of the experts here

isaacmajdi said:
I just heard it from one of the reviewers and I needed to confirm it from one of the experts here
Click to expand...
Click to collapse
Nope..you can just have 5g on one sim card available. Second sim can be still used for phone calls etc..
Hint: i am no expert...but common sense should apply

Yes 5g will disable other sim.Just tested

sakibm47 said:
Yes 5g will disable other sim.Just tested
Click to expand...
Click to collapse
so you say when 5g is enabled, phone is only single sim? I thought one 4G + one 5G. Could you please try if SIM2 can work with 5G? or 5G has to be SIM1?

ozkaya said:
so you say when 5g is enabled, phone is only single sim? I thought one 4G + one 5G. Could you please try if SIM2 can work with 5G? or 5G has to be SIM1?
Click to expand...
Click to collapse
When 5g is enabled, phone is only single sim and sim1or2 doesn't really matter.

Yes poco said that when you use 5G phone will be single sim till they will give update that will make 1 sim 5G and other will be 4G

You just have to read the user guide.........
About Dual SIM:
• Supports Dual SIM cards with no carrier restrictions, single 5G or dual 4G
connectivity ①
• Supports Dual Nano-SIM card slots, either card can be set as the primary
card
• Supports single SIM 5G/4G+/4G/3G/2G
• Supports Dual SIM 4G+/4G/3G/2G
• Supports Dual SIM VoLTE HD calling ②
Note ①: 5G support depends on the local telecom operator’s network; if
the primary card 5G is enabled, the secondary card will not be available;
subsequent software upgrades will include support for primary 5G and
secondary 4G/3G/2G card mode function in dual-card situations.
Note ②: VoLTE service availability depends on the local telecom operator’s
network and service deployment
Not so complicate....

So according to the user manual dual sim support while 5g enabled is coming with a future update? the phone is five months old, did the promised update come through yet? are all other ROMs available for this device have the same issue?

The promised update is yet to come .

isaacmajdi said:
So according to the user manual dual sim support while 5g enabled is coming with a future update? the phone is five months old, did the promised update come through yet? are all other ROMs available for this device have the same issue?
Click to expand...
Click to collapse
The phone was launched 5 months ago but probably due to the pandemic there is surprisingly little development and discussion from the community's side. Barely 4 roms.
I have been waiting 2 months now to upgrade because there is no way I ever use MIUI.
Last week LineageOS was released, but it's Android 10, and only initial build.
I will probably wait or lineageOS 18 before I buy this phone, but this means waiting few months the way things are going.

Dont forget that very few people use dual sim on their phone... Not a priority to fix ;o)

Mastakony said:
Dont forget that very few people use dual sim on their phone... Not a priority to fix ;o)
Click to expand...
Click to collapse
I would say there are more dual sim users than 5G users, maybe that's it.