Develop Bugs

[Q] Dual sim adapter

Hi all,
As anyone ever tried dual sim adapter on our phone?
Regards
Gaarapt

Which phone model?

from i5800 and i5801 probably he means as model .

hmm, interesting...is it possible to do it? would be a great help, if someone please post some info about it.

Yea i work at my brothers local phone shop and we use these all the time. I've used it on those phones without any issues. If you want to PM me i can point you to where i get them from?

dual sim ?
RHOUSMAN said:
Yea i work at my brothers local phone shop and we use these all the time. I've used it on those phones without any issues. If you want to PM me i can point you to where i get them from?
Click to expand...
Click to collapse
hey there...Can u give me info about dual sim adapter for our g3
like how it works and where to get ?

dual sim ?
RHOUSMAN said:
Yea i work at my brothers local phone shop and we use these all the time. I've used it on those phones without any issues. If you want to PM me i can point you to where i get them from?
Click to expand...
Click to collapse
hey there...Can u give me info about dual sim adapter for our g3
like how it works and where to get ?
i cant believe it is possible..

here is the video about duel sim adaptor...YouTube

I have never ever seen an Android phone with a dual sim... But I want to

this could be very functional. and could save a lot of time switching cards.

there are a few dual sim android phones like http://www.fonearena.com/blog/33946/motorola-xt800-dual-sim-android-phone-review.html
but only 550mhz cpu...
all the dual sim androids are gsm+cdma
sadly these dual sim adapters cant do dual sim standby....
meaning u cant call or recieve calls and sms when u select the first sim on the second sim

ak700 said:
I have never ever seen an Android phone with a dual sim... But I want to
Click to expand...
Click to collapse
Check out Motorola XT800. Its dual SIM (GSM+CDMA) phone, but too expensive for its specifications.
http://www.gsmarena.com/motorola_xt800_zhishang-3073.php
EDIT: unreal3000, didn't notice that you too provided a link of the same model.

would this be a form of plug and play or would you need to solder it on mobo of the phone?

nsm1234 said:
Check out Motorola XT800. Its dual SIM (GSM+CDMA) phone, but too expensive for its specifications.
http://www.gsmarena.com/motorola_xt800_zhishang-3073.php
EDIT: unreal3000, didn't notice that you too provided a link of the same model.
Click to expand...
Click to collapse
xD no prob! i first found it strange reading ur post! then realized i ddnt mention
which phone the link was!

!
hasjee said:
would this be a form of plug and play or would you need to solder it on mobo of the phone?
Click to expand...
Click to collapse
none of them need soldering...but most of them require you to cut both the sims
to make them smaller...dont worry it wont damage the sim and they give u an adapter incase you want to use the sims again....but the ones which can use 3g are much more expensive!

cutting them in pieces to make em fit wont be a prob, you could always get a new sim with your old phone number. and that it doesnt require soldering is a BIG +++ to this. im getting more and more interrested.

From my experience (and i have a fair bit) its a piece of cake. Never had any issues what-so-ever

With such a dualsimadaptor do you have to reboot to use the other sim or can you switch between the two simcards when your phone is on?
sorry for my noob question

Blackyx007 said:
With such a dualsimadaptor do you have to reboot to use the other sim or can you switch between the two simcards when your phone is on?
sorry for my noob question
Click to expand...
Click to collapse
no reboot!

Intresting....

[Q] Dual Sim V.S one Sim

Hi guys
i want to buy " HTC Desire 816 "
but i want to ask
dose the 1 Sim version get Different from the Dual Sim Version
i mean dose the Dual Sim version get Freezes like the Samsung Dual Sim phones ?
or the hardware get changes from the two versions
or its hard to find the Solving problems for the Dual Sim Version because the dual Sim is not very famous
In general which version is the best to buy?
thanks all
​

There exactly the same except the dual sim has two sim cards, nothing else is changed.
However single sim has NFC and dual sim does not, so if thats a big deal for you stick with single sim.

Also, single sim supports LTE but dual sim supports only upto 3G, and only in one of its slots.
however, I've had no problem regarding Mods and Roms for my Dual Sim 816, and it's the best dual sim phone I've had as I haven't had any network and antenna problems with it.

thank you guys
i asked this question because in Samsung devices the Dual Sim Version freezes a lot
and i hadn't use HTC Devices ever
i think i will take the Dual Sim version
because my country doesn't support the LTE by the way
and i don't use the NFC already
but i want to ask some other questions
winch version is more famous ?
dose the devices has notification LED ?
and what do you think is the Negatives of the device ?
thanks all
​

xahmad.mu said:
thank you guys
i asked this question because in Samsung devices the Dual Sim Version freezes a lot
and i hadn't use HTC Devices ever
i think i will take the Dual Sim version
because my country doesn't support the LTE by the way
and i don't use the NFC already
but i want to ask some other questions
winch version is more famous ?
dose the devices has notification LED ?
and what do you think is the Negatives of the device ?
thanks all
​
Click to expand...
Click to collapse
If you don't NEED two SIMs, go with the single SIM. Simply because it does have the extra features just in case.
There both just as "famous" and they bith have a notification light.

FoxyDrew said:
If you don't NEED two SIMs, go with the single SIM. Simply because it does have the extra features just in case.
There both just as "famous" and they bith have a notification light.
Click to expand...
Click to collapse
i need the Dual Sim because in my country we can't make calls from the " 3G " lines
we have to buy a line for make calls , send messages
and another line to surf internet by " 3G "
and thank you for your answer

xahmad.mu said:
i need the Dual Sim because in my country we can't make calls from the " 3G " lines
we have to buy a line for make calls , send messages
and another line to surf internet by " 3G "
and thank you for your answer
Click to expand...
Click to collapse
If you "need" the dual sim anyways what was the point in making this thread...?

FoxyDrew said:
If you "need" the dual sim anyways what was the point in making this thread...?
Click to expand...
Click to collapse
I have said to you that Samsung Dual Sim devices freezes a lot
and i want to see if that Happen in the HTC also
cheer up man

Is it possible to use two SIMs on a single SIM S9+

Evil Samsung does not sell dual sim models in Australia... Is there a way to use two sims in their single sim phones? Was this ever possible with S7 and S8 phones?
I have an international model S7 edge but decided to get an Australian S9+ because they receive better service and support here, well, actually I broke the screen of that S7 edge, again, and the repairing cost by a 3rd party just made it pointless, all because Samsung Australia won't repair it for me (for a more reasonable A$210) for it is an international model (UAE).
If this is technically possible, best case scenario I just need to find a correct SIM tray?

You can use two different SIMs if the phone is not locked to a particular network.
However, if the phone is not Dual SIM, you will not manage to use both cards at the same time.

RossTeagan said:
You can use two different SIMs if the phone is not locked to a particular network.
However, if the phone is not Dual SIM, you will not manage to use both cards at the same time.
Click to expand...
Click to collapse
So you are saying the hardware is there, but the software won't allow me to use both SIMs at the same time?
I take it as flashing dual SIM ROM would not only void warranty, but beats the purpose of buying an authentic local market device in the first place?

sunheatyy said:
So you are saying the hardware is there, but the software won't allow me to use both SIMs at the same time?
I take it as flashing dual SIM ROM would not only void warranty, but beats the purpose of buying an authentic local market device in the first place?
Click to expand...
Click to collapse
No, what I mean is that you can use two SIM by switching them and having only one at a time inserted in the phone.
If the phone is not dual SIM, you can have two SIM cards working on it only if the phone is a Hybrid Dual SIM.
If the phone is SINGLE SIM, you can't do anything about it.
Hope that this answers your question.

SM-N975F Dual SIM?

Hi all,
Is it possible to make the SM-N975F support dual sim?

SM-N9975F by default is dual sim.

liamR said:
Hi all,
Is it possible to make the SM-N975F support dual sim?
Click to expand...
Click to collapse
u can put 2sim / or 1sim and 1 sdcard
Sent from my SM-N975F using Tapatalk

My SM-N975F sim card drawer does not have a room for 2 sims only one sim and a SD card. I tried to put the second sim in the SD card slot but there is no way to fit it. Also there isn't 2 IMEIs on the phone box or in the phone settings.

liamR said:
My SM-N975F sim card drawer does not have a room for 2 sims only one sim and a SD card. I tried to put the second sim in the SD card slot but there is no way to fit it. Also there isn't 2 IMEIs on the phone box or in the phone settings.
Click to expand...
Click to collapse
than ur phone not n975f DS , i think and check ur mobile info using phone info app from play store or in setting about phone/ model number
Sent from my SM-N975F using Tapatalk
View attachment 4988127

yeah there are 2 versions, if you picked up from a network chances are it is a single SIM variant, if you purchased unlocked through the likes of Samsung it will have "DS" on the end of the model number meaning it is a dual SIM variant.
it's confusing but it's just the way it works unfortunately as it cuts cost on network provided phones.
basically if you want dual SIM your best bet is to purchased direct from Samsung or a third party who sells the dual SIM version, but a network provider is likely to give the single SIM to stop people using 2 networks and to cut the cost of a second modem.

So there is no way to mod or activate the dual sim in the SM-N975F (without DS) model? Is it hardware limitation?
If I remember correctly the single sim Note 9 did have a mod for this.

liamR said:
So there is no way to mod or activate the dual sim in the SM-N975F (without DS) model? Is it hardware limitation?
If I remember correctly the single some Note 9 did have a mod for this.
Click to expand...
Click to collapse
There is no 2nd SIM to activate on your phone, it is physically lacking the hardware to support a 2nd SIM:
SM-N975F : Single SIM
SM-N975FD or SM-N975F D/S : Dual SIM
If you want to eliminate all doubt as to whether your phone indeed does have a physical 2nd SIM, the only other possibility that I can think of is if you buy a Dual-SIM Card Tray & flash a (compatible?) Dual SIM firmware, but, doing so at your own risk.
As others have stated, the carrier branded versions are Single SIM & in all likelihood, are not capable of being converted to a Dual-SIM model.

The firmware for N975F and N975FD is the same, there is no specific FW for dual SIM.

OnnoJ said:
The firmware for N975F and N975FD is the same, there is no specific FW for dual SIM.
Click to expand...
Click to collapse
Thx for clarifying that firmware for both is same. My phone specs shows that model is SM-N975F but it is dual sim and it does not show anywhere that it is SM-N975F/DS or SD.
Why it is like that. Is there something wrong or just becoz they both have same firmware so it just shows N975F.

Nothing wrong, I think only the box showed that it was DS.
Mine also N975F/DS, but does not show on outside phone nor in phone info in settings.
It does show 2 IMEI-nrs both on outside/back of phone as in phone info, that's the giveaway!

Hi you can convert a single sim note 10+ to dual sim, it does have the hardware as does the s10+ I have done it to both. Once you have activated and tricked system into thinking its a factory dual sim device. you have to write another imei to the second sim other it will be 000000000+ but But thats easy to do using any number of commercial tools i used chimera tool

aman2017 said:
Hi you can convert a single sim note 10+ to dual sim, it does have the hardware as does the s10+ I have done it to both. Once you have activated and tricked system into thinking its a factory dual sim device. you have to write another imei to the second sim other it will be 000000000+ but But thats easy to do using any number of commercial tools i used chimera tool
Click to expand...
Click to collapse
IMEI numbers are assigned to a specific logic card serial number, anybody assigning an imei
Number the way you point out, is performing an illegal action

Does somebody make it works?

See on the box it's written
SM-N975F
ON THE QUICK START GUIDE ITS written SM-N9750
ONLINE when I search the IMEI it's written SM-N9750
INSIDE THE DEVICE ITS SELF AT ABOUT
ITS WRITTEN SM-N975F/DS please I'm confused. Is this phone 2 SIM , is it 5G also when I on it, it shows 5g but I can't find the network inside the phone
It came with a single SIM tray and slot two IMEI shows all zeros
WHEN I checked device infos using apps, it's written SM-N975F

Deseril said:
See on the box it's written
SM-N975F
ON THE QUICK START GUIDE ITS written SM-N9750
ONLINE when I search the IMEI it's written SM-N9750
INSIDE THE DEVICE ITS SELF AT ABOUT
ITS WRITTEN SM-N975F/DS please I'm confused. Is this phone 2 SIM , is it 5G also when I on it, it shows 5g but I can't find the network inside the phone
It came with a single SIM tray and slot two IMEI shows all zeros
WHEN I checked device infos using apps, it's written SM-N975F
Click to expand...
Click to collapse
Help me

Question Single to dual SIM possible?

Is it possible to convert network locked single SIM models to dual SIM?

im not familiar with this, but how does that even work? There's only 1 sim slot on the single sim version, and only 2 on the dual sim version. I guess you might be able to get some sort of modification or adapter board to connect for dual sim, but that would be a bit janky wouldnt it?

PhotonIce said:
im not familiar with this, but how does that even work? There's only 1 sim slot on the single sim version, and only 2 on the dual sim version. I guess you might be able to get some sort of modification or adapter board to connect for dual sim, but that would be a bit janky wouldnt it?
Click to expand...
Click to collapse
It has a single slot in the SIM tray, yes, but I hoping the internal hardware might be the same as a dual SIM model. That might be unrealistic as I can't find a region that offers both dual SIM and NFC. What I do know is that it is possible to convert at least some Oppo models from single to dual SIM by changing the region and flashing other firmware and of course replacing the SIM tray. After that, it works like a bought one.

just sell yours and buy a dual sim model, why go through all this trouble?
it will probably cost the same, if not a little bit more, but it would be a genuine dual sim model.
most dual sim budget phones dont have nfc anyways.
i dont know any other information, so sorry for not being much of a help

Yes the phone is dual Sim variant , just need to buy dual Sim card tray or if inpatient, and a steady hand, just cut the Sim card holder for second Sim out.

Blank tape said:
It has a single slot in the SIM tray, yes, but I hoping the internal hardware might be the same as a dual SIM model. That might be unrealistic as I can't find a region that offers both dual SIM and NFC. What I do know is that it is possible to convert at least some Oppo models from single to dual SIM by changing the region and flashing other firmware and of course replacing the SIM tray. After that, it works like a bought one.
Click to expand...
Click to collapse
The Australia prepaid Optus has both dual Sim and nfc

smiley.raver said:
Yes the phone is dual Sim variant , just need to buy dual Sim card tray or if inpatient, and a steady hand, just cut the Sim card holder for second Sim out.
Click to expand...
Click to collapse
Sorry if this is a dumb question, but why the heck would they cover up a second sim slot if available? Isn't a second sim slot better for their marketing of the device? Wouldn't the device show up as dual sim in the about phone section of settings, despite only having one usabale slot? It doesn't sound like a smart thing to do.
They're also wasting that "precious" in-phone space, not to mention the manufacturing costs to make a dual sim model (which is single sim), only to sell it for the same or less than an actual dual sim model with a usable second sim slot.
Usually what they do is they remove the second slot to make room for the nfc module. That's why you don't often see dual sim phones with nfc in the budget/mid range, it's either one or the other.

Mate, completely agree, but you need to ask mtk/Oppo/realme
The only explanation I can think is, that in Australia, it is extremely rare to be able to buy dual Sim straight off the shelf, usually havego order in(from my experience abut that could also just be Sony phones as well) only my second realme and the C3 that I had before this phone was exactly same
Again, question needs to be asked off manufactures lol
I can only tell you what is and what can be done, as I modified the Sim card tray as stated and put Sim In and there you go.

Wow. I thought that they might disable dual sim since the model is a "single sim" one, despite it having the hardware capabilities.

It is disabled in Australian firmware. That is not surprising for a carrier locked model for obvious reasons but what is somewhat surprising is that the carrier unlocked Australian version which seems to be only sold online direct from realme is also the same model at the same RRP. I think it might be realme's only single SIM model sold in AU. I suspect you might lose NFC if you install dual SIM firmware on it but smiley.raver would know for sure.
I can only speculate that since Australia is a relatively small market it is not worth the effort of manufacturing a special hardware variant for it. OTOH, if that is true that suggests the model might have latent NFC characteristics in other markets which seems a bit of a stretch, so it maybe that it is harder to subtract the 2nd SIM contacts than add NFC. TBH, for such a low power CPU its a bit surprising to see NFC anyway but Optus would only care about the end result for the cheapest cost and maybe the different firmware and modified SIM tray is the cheapest manufacturing option.

As attached. Wish I had some spare tags lying around to show working but screenshot is best J can do lol

What combo of region and firmware are you using or other magic? It's interesting that the firmware you are using has auto-detected either the 2nd SIM or NFC when that combination is not sold in any region.

Blank tape said:
What combo of region and firmware are you using or other magic? It's interesting that the firmware you are using has auto-detected either the 2nd SIM or NFC when that combination is not sold in any region.
Click to expand...
Click to collapse
Also interested in knowing how to use a second Sim. Out of curiosity I modified the Sim tray, but the 2nd Sim was not detected. Android 11, rmx3201AU_11_C.09

If you search the Oppo threads you can find the odd guide on changing the region for example this thread I don't know whether that is sufficient and if its is whether the mix of Australian firmware and different region causes a problem with future updates. I'm lead to believe that changing the region via the process in the linked thread is not possible with Android 11 or at least after some particular update on Android 11. If changing the firmware is required I don't know whether there is a suitable image that will flash itself but there are programs that will do that e.g. mtkclient.
Hopefully, smiley.raver will comes back and provide some more pointers or maybe you will if you're braver and less patient than me.
Good luck!

Blank tape said:
If you search the Oppo threads you can find the odd guide on changing the region for example this thread I don't know whether that is sufficient and if its is whether the mix of Australian firmware and different region causes a problem with future updates. I'm lead to believe that changing the region via the process in the linked thread is not possible with Android 11 or at least after some particular update on Android 11. If changing the firmware is required I don't know whether there is a suitable image that will flash itself but there are programs that will do that e.g. mtkclient.
Hopefully, smiley.raver will comes back and provide some more pointers or maybe you will if you're braver and less patient than me.
Good luck!
Click to expand...
Click to collapse
Just an update, phone automatically updated with rmx3201_11_C.11 but still only detects one Sim.

It won't happen by itself. You need to change the region code and/or install firmware from another region to have the 2nd SIM detected. If you need to rollback to Android 10 so you can change the region code there is a link to a rollback package in the post introducing realme UI 2.0 / Android 11 on the (Indian) realme community site. If you can't find it let me know and I'll have a look later.

Yes you will need to roll back to adtod 10, to change region for firmware, as I said in running Australia Optus prepaid region and I get the updates as well as the dual Sim and nfc(if you need a quick way to test of nfc works use a bank card with a chip on it , turn nfc on and putghw card near the phone, phone will either do nothing or say no process to view the data or something along those lines which means it has recognised a nfc device near it.

I'm not sure I was able to parse that properly. Which region did you change to? Are you saying that you didn't reflash the Optus firmware and continue to receive updates?

Just used the region changing method, selected the Australia Optus prepaid, , phone restarts no data lost.
Done on 2 c21 phones, both have working nfc and 2nd Sim.
I will back up my other 'testing' c21 and try make short video to show it all working,
Region changing in android 11 requires god like access it seems to access that same section, there is probably a way to do it. But just easier to roll back to android 10, change region, reflash you backup, then wipe (this is only if already upgraded to 11, that there is a data loss) mdc, usereata, metadata and then you will be on working android 11, dual Sim, and nfc
I will see if I can find an old sim card, and uploaded short video with both those features working, the 2 c21 phones I have were also brought from different supply chains as well

smiley.raver said:
Just used the region changing method, selected the Australia Optus prepaid
Click to expand...
Click to collapse
Excuse my density, but I would have assumed that would be the region the phone ships with.
I will see if I can find an old sim card, and uploaded short video with both those features working, the 2 c21 phones I have were also brought from different supply chains as well
Click to expand...
Click to collapse
Don't do a video just for me. I never watch them, but I wouldn't mind reading your comments on one of the existing guides about any gotchas or steps that can be eliminated. I don't really understand what the software is doing apart from enabling the region change and possibly other codes. Would be good if there was an open source version of the tool.
BTW, according to a post on OzBargain there seem to be 2 versions or perhaps production runs of the Optus C21. The later one has a screen protector applied and there is no carrier lock. Looks like even the one realme sells directly is also (Optus?) locked as their web site changed recently to state they woud supply an unlock code with the phone.