Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
UltimateX29 said:
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
Click to expand...
Click to collapse
We all r out of luck until we get out of this goddamned place
UltimateX29 said:
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
Click to expand...
Click to collapse
This is the main issue of CDMA companies with mobile phones. In the previous week I went for a tour out of the CDMA range and due to out of the range I haven't even open my website on phone to check it progress because of the net issue. When you switch from one mode to another so it stop even opening browsers.
UltimateX29 said:
Hi all,
I've been having a hard time understanding the way CDMA companies work with mobile phones.
In Yemen, there are 4 carrier providers. 3 of which are GSM 2G companies and one which is CDMA LTE company.
The CDMA company is called Yemen Mobile.
Ever since they introduced 3G internet, all mobile devices had to be brought to IT geeks to configure devices to use 3G using DFS, CDMA workshop, or qpst and many other tools.
Now when the company introduced LTE, the same thing happened, people had to bring their devices to IT geeks working on shops to have them configure their mobile devices.
Standard configuration through mobile access points does not always work.
When I traveled to eygpt, I got a vodaphone SIM card and once I inserted the SIM, everything was configured automatically.
What is other companies worldwide have that Yemen Mobile doesn't?
This is frustrating. When I turn LTE data on, my phone becomes out of reach. I can't receive calls on as IT geeks say my phone cpu is snapdragon and I used the same phone in Eygpt with 4g working like a charm.
Can anybody explain?
Click to expand...
Click to collapse
The CDMA technology approximately dead because the US Carriers which introduced it transfer its towers to a new LTE technology and uses VoLTE for voice calls.
In Yemen the situation is different because the company (Yemen Mobile) hasn't upgraded its equipment since CDMA/EVDO first days, and now the company want to be the first to introduce LTE services but it fails until now because the compatibility and their towers does not configured with right settings.
I have Galaxy S20 FE 5G from US cellular, I inserted a 4G sim to it, it's either works in CDMA or LTE modes.
can't work at the same time.
I tried to play with some settings in DFS but I finished with neither LTE data nor CDMA signal.
but luckily I restored EFS2 and now working either CDMA or LTE.
There is another carrier (GSM based) in Yemen called (YOU) just add the Access point to the phone and it will work immediately.
Related
Ok, so I've searched all over and haven't had much luck. I have no experience with cdma phones, as t mobile is all I've ever had.
I was given a new US Cellular HTC Hero s. I opened it up and saw the sim slot and though, sweet I can replace my sensation with it (I smashed the screen pretty bad). Well, that was a no go, as the phone is cdma. Looking online though, I see it can run in gsm (options global mode, cdma mode, gsm / umts mode. I unlocked the bootloader using the htc site (not sure it matters) and popped in my sim card again, and tried both global and gsm mode, though neither got signal or would dial out. (under networks, it had the tmo apn info.)
So, is the GSM mode offered on this phone only for non US bands? Would a custom rom (now or down the road) allow it to work on tmo? I read something about the HTC Merge and someone being able to switch out the modem in the rom that allowed it to work in the US, but that is well beyond me. I can follow instructions, work ADB and flash roms.. but thats about it.
Is it possible, or will it soon be, to have this phone work on GSM or am I just stuck trying to sell it as a us cellular phone (or perhaps another cdma carrier.. like I said, I don't know anything about cdma)
As a Canadian I'm not sure about who owns US cellular or if they are their own company but I'm guessing they work like Verizon world phones. They have sim card slots but will work only outside of the US. If those verizon phones are used within the States, they will only pick up Verizon's frequency, as opposed to T-Mobile or AT&T where you can unlock them and use them with any GSM carrier within the States. But yeah, you can unlock it and it will work with any GSM carrier outside the States but within the States I think it will only work under US Cellular CDMA network...please correct me if I'm wrong.
That's right, u.s. cdma "world phones" have gsm radios but are locked down from connecting to gsm networks in the u.s. This is not just the normal sim lock found on gsm phones but they are hard coded to ignore u.s. gsm networks.
Some have been unlocked to work on any network through various methods including flashing a modem from a non-us varient of the same phone and other hacks. I can't comment specifically on this phone however.
Sent from my SPH-D700 using XDA App
Well, that points me in the right direction, and confirms what I read about swapping modems (on the other phone mentioned).
So basically it's software telling it not use a certain frequency, and not that the phone itself is incapable of picking it up (had my doubts about that)
Pretty shady the way phone companies are allowed to operate (don't get me started on my unlimited internet in my contract [pre data caps in tmo]. "Hey! check it out, this phone uses data 5 times faster than your old one, oh, and you get half as much too) sorry, end of rant.
I'll keep searching, and post if I find something..
On a side note, can cdma phones be flashed to another cdma carrier like verizon or sprint, or is it the same deal, coded to only use a certain frequency range?
only thing I've heard of is flashing sprint and verizon phones to cricket, metro pcs and boost.
Ok guys Here is my problem
I live abroad and I have a Verizon Galaxy S3 with unlocked SIM capability so I'm using it as a GSM phone. The problem is that my GSM network provider does not have a 3G network, however, there is this other mobile network company that does offer a 3G network but it operates on CDMA. So I flashed my phone using DFS to the CDMA network and I managed to get the phone work for both calls and Data. But now since I usually use my GSM number I have to switch back and forth between GSM and CDMA whenever I want to use data and that is pretty inconvenient, in addition, whenever I use 3G I loose my GSM connection.
So what I was thinking is whether I can activate both my GSM network and the 3G connection from the CDMA network at the same time so that I can surf the web with 3G speed and make calls using my GSM number at the same time.
To be honest with you I've been trying to get that done with no hope, I've tried all the modes the "Phone info" app with no luck, so I'm here now asking for your help.
come on guys
I can't believe no one here does not have an answer
Hi Guys,
I'm working on a school project to research on the possibilities of sim card-less mobile technology. I am looking at replacing the sim card with a mobile application that would be able to verify the user via a mobile application.
Understand that CDMA technology doesn't require a sim card, but it is not available in my country (Singapore). Thus would like to have a discussion here on whether sim card-less is possible for GSM handset?
As the world is going LTE/4G now, would the removal of sim card obstruct us from going forward towards the LTE/4G technology?
Appreciate your replies! Thanks a million!
woshiahhao said:
Thus would like to have a discussion here on whether sim card-less is possible for GSM handset?!
Click to expand...
Click to collapse
An app could be malicious/malfunctioning and even not contain the true credentials to identify you as the true user of the contract with your service provider. Why do you think SIM cards are encrypted?
Not sure what you're trying to accomplish. To create an app to use your phone without a SIM? What's the purpose? Are you sure you're doing this for "school research"?
SecUpwN said:
An app could be malicious/malfunctioning and even not contain the true credentials to identify you as the true user of the contract with your service provider. Why do you think SIM cards are encrypted?
Not sure what you're trying to accomplish. To create an app to use your phone without a SIM? What's the purpose? Are you sure you're doing this for "school research"?
Click to expand...
Click to collapse
Yeap, it's for a school project.
I've read that Verizon and Sprint phone uses CDMA and doesn't require SIM card. Is that true? How is the true user verified in that case?
woshiahhao said:
Yeap, it's for a school project.
I've read that Verizon and Sprint phone uses CDMA and doesn't require SIM card. Is that true? How is the true user verified in that case?
Click to expand...
Click to collapse
Verizon and Sprint non-LTE devices do not use SIM cards.
Traditionally, CDMA devices in the US do not use SIM cards (Verizon and Sprint are CDMA, AT&T and T-Mobile are GSM).
Each phone has a built in identifier (called an ESN [Electronic Subscriber Number] or MEID [Mobile Equipment Identifier]) on top of the IMEI number that every phone in the world has. The phone is programmed on the computer to connect to a certain network (the APN and such are already filled in and usually not user-accessible on the phone itself, unlike with GSM devices).
Instead of swapping a SIM card, a user will go onto the website of the provider into their account and put in the device's ESN number. The device then provisions itself (known as activation) and is on the user's account.
However, all networks in the US, both CDMA and GSM, use LTE now. LTE is a GSM technology and therefore requires a SIM card to authenticate the device on the network. So even CDMA networks require SIM cards because their devices are LTE capable. Because of this, and because newer CDMA devices also support GSM (for traveling, since few countries use CDMA outside of the US), you can put a GSM SIM card in a CDMA/LTE device and it will work on GSM networks. Some networks, such as Sprint, try to counter this by artificially blocking out US SIM cards from other providers (so you can put in a Canadian SIM card for example and use a Sprint CDMA/LTE device on a GSM network, but the phone will not accept for example an AT&T SIM card).
The way everything is headed though is that everything (calls, text, mobile data) will be carried over LTE. Voice over LTE is called VoLTE.
I agree with @product F
Sent from my GT-I9300 using XDA app.
Hello! I have been at this for a week now.
This is my situation, I bought a fully unlocked dual sim wcdma phone (Mpie 909T) running 4.4.2 KitKat.
I want to use this phone on my straight talk plan, but I only get service from Verizon wireless where I live.
I did some searching and found that I could use a R-UIM card to pick up signal from Verizon BUT I can not find where to buy one at (unless I buy bulk for a couple hundo). So I'm at a loss. I didn't realize that I didn't get service from at&t or T-Mobile till I got the phone and went to the straight talk site and it told me to buy a sim card activation kit, (checked on AT&T site to make sure I would have service and it showed that I would)... so I went and bought the kit only to find out that they actually don't have service out here. ? so if there is no way to find a r-uim card, would there be a way to change the radio frequencies in the phone? But I would also need a MEID # to activate on straight talk CDMA (Verizon towers). Or can I get one of those sim read/writer kits on eBay and program it to work?
I have not rooted the phone yet.
PLEASE HELP!!! I love this phone!!
I've been using the phone via WiFi from my old dx2 that's currently active.
Sadly, you cannot access a CDMA2000 network like Verizon's from a device that does not have a CDMA2000 transceiver. CDMA2000 is technologically incompatible with GSM and UMTS (sometimes called WCDMA). There are some dual mode devices, but Verizon explicitly forbids non-Verizon devices on their network. Even if you could somehow get a RUIM for Verizon, and their blessing to use it, your phone would not work unless it specifically has a CDMA transceiver in it. (remember, CDMA and WCDMA are not the same)
You need a device that supports not only the right technologies, but also the right frequencies. Most Dual-SIM phones are based exclusively on GSM and UMTS/WCDMA, and often operate on frequencies that are not comparable with US GSM operators. AT&T operates on GSM850, GSM1900, UMTS850, UMTS1900, and several bands of LTE. T-mobile operates on GSM1900, UMTS1700, UMTS1900, and several bands of LTE as well. However, most networks outside the Americas use GSM900, GSM1800, UMTS2100, and LTE800, 1800, and 2600.
You can use a site called GSMArena to check which bands your device has. If you want to use a CDMA carrier (Verizon, Sprint, and many rural operators in the US), you generally have to buy a phone with their branding or one of their partners.
Sorry to be the bearer of bad news
I have similar question. Since I am currently using ST with a Verizon phone ( CDMA) could I buy a new phone to replace current one ? And does it need to be another CDMA phone? And what is LOCKED/UNLOCKED have to do with it ?
Sent from my SCH-I500 using XDA Free mobile app
This is a very large problem. I am in the same boat. Up here, we have Verizon,and ATT. that's it. My first phone here was ATT. worked great in town. As soon as I got to my house dead.,... I bought a Nexus 6 popped the Verizon SIM in it called straight talk they registered me on Verizon's network and boom Full LTE, and VoLTE. My issue now though is I want to try other devices and it seems that the N6 is literally the only non branded phone I can use. There are some awesome new Chinese devices I would love to try and on paper have the correct signals but still claim no Verizon. I am frustrated and stumped after weeks of research and conflicting reports. Does anyone know what is going on? Thanks in advance
i have lg g2 vs980. my phone software is lolipop 5.0.2 vs98039a. i have some problem in this phone when i useing reliance cdma sim.
1. when i use reliance cdma sim i do only one call any mobile no. if want i do another call so call not connected. when i restart the phone so call is connect only first time. on 2nd call is same problem.
2. 3g network not work with 1x EvDo.
so can u solve my problem
Hi,
Most of mobile phones are only capable to connect to GSM networks. In my country, CDMA is almost dead. Only Smartfren Telecom was left here. It's a CDMA operator that working on bringing LTE-A across Indonesia (even if it's a GSM service, that's why I said that). It has self-branded phone 'Andromax' that works on both CDMA & GSM networks (but not all). On some countries it's even already dead. May be you could come to Indonesia and purchase one Andromax smartphone on local stores here :silly:
The only suggestion I could give to you is only to use GSM operator. It has so many advantages and enhanced technologies. CDMA is almost dead and outdated.
Sent from my GT-I9500