Develop Bugs

What are GSM and CDMA ?

I see these words on some threads in development section. Could you please tell What are they ?

It's a network, GSM is 2G and CDMA is 3G. Correct me if I'm wrong.

Giankwang said:
It's a network, GSM is 2G and CDMA is 3G. Correct me if I'm wrong.
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GSM now more describes a umbrella of generations rather than specifically 2G I reckon.
To the OP thought GSM and CDMA are simply terms used to describe different systems used for mobile phone networks.
GSM is the more popular.

AstroZombie1 said:
GSM now more describes a umbrella of generations rather than specifically 2G I reckon.
To the OP thought GSM and CDMA are simply terms used to describe different systems used for mobile phone networks.
GSM is the more popular.
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OOPSS!!
Sorry, I didn't really know about that . My mistake.

Giankwang said:
It's a network, GSM is 2G and CDMA is 3G. Correct me if I'm wrong.
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Dis guys answer is the 1 u want other guys was just buffling with knowlege unneeded

AstroZombie1 said:
GSM now more describes a umbrella of generations rather than specifically 2G I reckon.
To the OP thought GSM and CDMA are simply terms used to describe different systems used for mobile phone networks.
GSM is the more popular.
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Click to collapse
GSM is more popular outside of the US. CDMA is used by most US cell providers.

cdma is mostly provider verizon

Difference between GSM and CDMA
In cellular service there are two main competing network technologies: Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA).
Both boast "3G" standards, or 3rd generation technologies.
Only GSM phones use SIM cards. CDMA carriers require proprietary handsets that are linked to one carrier only and are not card-enabled (for the most part).
http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm

At& t and t-mobile usethe gsm system.
Sprint and verizon use cdma.
The two frequencies are incompatible.
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netizenmt said:
GSM is more popular outside of the US. CDMA is used by most US cell providers.
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Hence why it'd be more popular as the rest of the world is evidently bigger than the US. Also it's actually more popular and practical as you can use phones ( that are GSM ,) anywhere , with any carrier in the entire world , provided you just unlock your phone of course, so .. Practicality = GSM, usability = GSM, freedom= GSM , better phones actually = GSM.
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Giankwang said:
It's a network, GSM is 2G and CDMA is 3G. Correct me if I'm wrong.
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Thats GSM and WCDMA not CDMA
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jpzzle said:
Hence why it'd be more popular as the rest of the world is evidently bigger than the US. Also it's actually more popular and practical as you can use phones ( that are GSM ,) anywhere , with any carrier in the entire world , provided you just unlock your phone of course, so .. Practicality = GSM, usability = GSM, freedom= GSM , better phones actually = GSM.
Sent from my R800i using xda premium
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I beleve some networks in japan and china use CDMA too.
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[Q] Stupid Question abot GNEX from Korea

Im Active duty military so i end up where every they send me. I had to purchase a local phone since i will be in korea for the next year. I chose the Samsung Galaxy Nexus as my phone. i wanted to know if i can still root this phone and flash a custom rom with out messing up the phone.
The model Number is SHW-M420K.
Its running ISC 4.0.1.
The boot loader says the Board name: tuna Rev 9.
The base band is: M420KRKK7.
Kernel Version is: [email protected] #1.
Build Number ITL41F.M420KREK24.
Please Let me Know Thank You

This is not a stupid question.
The simple answer is that the M420K is the KT Telecom version of the HSPA+ Galaxy Nexus, internationally known as I9250 but has bigger battery. So, yes. You can do all of the above.
For further info contact impala.cap2ya by PM or email him on [email protected]

samizad said:
This is not a stupid question.
The simple answer is that the M420K is the KT Telecom version of the HSPA+ Galaxy Nexus, internationally known as I9250 but has bigger battery. So, yes. You can do all of the above.
For further info contact impala.cap2ya by PM or email him on [email protected]
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Almost the same question though it might be repetitive or stupid. I have that HSPA+(3G) version of KT Telecom GN coming a few days later. Is that the GSM GNex? That is, will all the applications, custom ROMs and firmwares for GSM version in XDA going to work with my phone? I checked out both forums for GSM and CDMA version since all Korean phones use CDMA network, but it seemed like CDMA forum here was all about LTE version serviced by Verizon.

team56th said:
Almost the same question though it might be repetitive or stupid. I have that HSPA+(3G) version of KT Telecom GN coming a few days later. Is that the GSM GNex? That is, will all the applications, custom ROMs and firmwares for GSM version in XDA going to work with my phone? I checked out both forums for GSM and CDMA version since all Korean phones use CDMA network, but it seemed like CDMA forum here was all about LTE version serviced by Verizon.
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Yes. HSPA+ =GSM
Sent from my Galaxy Nexus using xda premium

team56th said:
Almost the same question though it might be repetitive or stupid. I have that HSPA+(3G) version of KT Telecom GN coming a few days later. Is that the GSM GNex? That is, will all the applications, custom ROMs and firmwares for GSM version in XDA going to work with my phone? I checked out both forums for GSM and CDMA version since all Korean phones use CDMA network, but it seemed like CDMA forum here was all about LTE version serviced by Verizon.
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Basically, the Korean Galaxy Nexus is not CDMA. It is GSM and works in Korea using the 3G WCDMA. You can confirm this by switching off the 3G in the Wireless Settings "Use only 2G networks" and you will see that you lose the phone signal and can't make any calls.

samizad said:
Basically, the Korean Galaxy Nexus is not CDMA. It is GSM and works in Korea using the 3G WCDMA. You can confirm this by switching off the 3G in the Wireless Settings "Use only 2G networks" and you will see that you lose the phone signal and can't make any calls.
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would a pentaband GSM model work in Korea if brought from the u.s./Europe?
If so, how difficult is it to get a prepaid or temporary sim card when visiting?
Sent from my Galaxy Nexus using Tapatalk

naerok said:
would a pentaband GSM model work in Korea if brought from the u.s./Europe?
If so, how difficult is it to get a prepaid or temporary sim card when visiting?
Sent from my Galaxy Nexus using Tapatalk
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Yes.
Prepaid or temporary sim card is pretty hard to come by cheaply if you want data.

Yes. Forget prepaid sim if you want 3G data.
Getting set up with a phone in Korea is a real pain for expats.
Sent from my Galaxy Nexus using xda premium

Unlock Verizon Nexus for T-Mobile?

So I'm thinking of buying a Verizon Galaxy Nexus.
I know it has a sim tray so i'm wondering if it can be unlocked for T-Mobile.
Any help would be appreciated.

djphooka said:
So I'm thinking of buying a Verizon Galaxy Nexus.
I know it has a sim tray so i'm wondering if it can be unlocked for T-Mobile.
Any help would be appreciated.
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Why wouldn't you buy the GSM version?

It wont work. Different technologies.

jhernand1102 said:
Why wouldn't you buy the GSM version?
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Because that would make sense.

Yea, It's just that the guy told me it has a sim tray so i figured i would post here to find out.
Anyone know where I can get the GSM version?
I don't want to pay $500 but ...
Thanks all

Try Negri Electronics
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djphooka said:
Yea, It's just that the guy told me it has a sim tray so i figured i would post here to find out.
Anyone know where I can get the GSM version?
I don't want to pay $500 but ...
Thanks all
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Sim tray maybe but the vzw one is cdma and the GSM one is...well..GSM.
Different technologies! Not compatible.

I have the Verizon phone and yes it does have a SIM card but it uses different radios. Verizon uses CDMA/LTE and T-Mobile uses GSM so you can put whatever SIM card you want in there but since it uses different radios it won't physically be able to talk to T-Mobile (or any GSM carrier's towers)

btw, what happen if you travel away USA in a country without CDMA?.
At least, the CDMA iPhone have a simcard tray but it's locked until your operator wants.

jairmoreno said:
btw, what happen if you travel away USA in a country without CDMA?.
At least, the CDMA iPhone have a simcard tray but it's locked until your operator wants.
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Starting with Verizon's 4G LTE phones they all require SIM cards. They were also used in 3G global phones (my old blackberry and droid pro had them) but the CDMA Galaxy Nexus isn't global so you'd just SOL.

well.
nope. it won't work cause it's not CDMA...

djphooka said:
So I'm thinking of buying a Verizon Galaxy Nexus.
I know it has a sim tray so i'm wondering if it can be unlocked for T-Mobile.
Any help would be appreciated.
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@[email protected] can't believe people are asking this question. The phone has been out for over 3 months now.

Besides, the SIM card slot is specifically for LTE... as in, the SIM card is an LTE SIM card. LTE, not HSPA+.
I can only think, because the AT&T (HSPA+) model would be more prolific among sellers, that you'll have a better time finding a better price than a Verizon (LTE) one.

jairmoreno said:
btw, what happen if you travel away USA in a country without CDMA?.
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Then you have no service. Grab a cheap GSM phone and pre-paid SIM.

Try the yellow or the sky blue Galaxy Nexus. Those ones will work on both Verizon and T-Mobile.

Thats odd cause I have done it before
nodstuff said:
Sim tray maybe but the vzw one is cdma and the GSM one is...well..GSM.
Different technologies! Not compatible.
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Click to collapse
Back when verizon did both GSM and CDMA I had a verizon phone that I got to work on tmobile. I think it might have been a windows phone, honestly it was a while ago. I had to pay for a network unlock code and patch a radio or something....anyway, just wanted to say that it is in fact possible. My phone did brick in about two months, but that might have been from getting it wet...anyway...Good luck!

derigoagin said:
Back when verizon did both GSM and CDMA I had a verizon phone that I got to work on tmobile. I think it might have been a windows phone, honestly it was a while ago. I had to pay for a network unlock code and patch a radio or something....anyway, just wanted to say that it is in fact possible. My phone did brick in about two months, but that might have been from getting it wet...anyway...Good luck!
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Total non sequitur. The phone in question must have been an old "world phone". The Verizon Galaxy Nexus never had any GSM radio whatsoever.
Also you bumped a 2 year old thread.
Sent from my Nexus 5 using Tapatalk

weirddan455 said:
Starting with Verizon's 4G LTE phones they all require SIM cards. They were also used in 3G global phones (my old blackberry and droid pro had them) but the CDMA Galaxy Nexus isn't global so you'd just SOL.
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For the CDMA GNex you would need either a CDMA or neutral carrier/MVNO (such as StraightTalk, Tracfone, etc.). I have a CDMA ex-VZW GNex (now running Unlegacy-Android 7.1) that I am taking to Tracfone (replacing a Tracfone feature phone) because Tracfone uses a mix of carrier towers (depending on location, either T-Mobile or VZW). My current feature phone uses T-Mobile towers - because I am bringing a CDMA phone under BYOP, I have to ask the carrier (Tracfone, in this case) to create a custom SIM Kit for the brought phone, and thus have to communicate the IMEI and MEID of the incoming phone (this information is in the phone under Settings). Yes - this also applies to lifeline feature phones supplied by Tracfone/Safelink (if Safelink supplied the phone, Tracfone is your MVNO). If you want a GSM version of the Galaxy Nexus, you would want the maguro (the Galaxy Nexus in AT&T Mobility or T-Mobile guise); because GSM is more popular overseas, they tend to get exported compared to CDMA or W-CDMA (Verizon or Sprint, respectively).

[Q] Can I use N7102 with Verizon?

Greetings all, I'm a noob to the forum, although I've been reading a lot useful posts from xda.
I have a question here: is it possible for me to use N7102 on Verizon network? I currently use Verizon Droid RAZR and I also have an old GSM iphone 3GS on which I have a foreign SIM card. Since N7102 supports both GSM and UMTS with dual-SIM and dual-standby feature, I really want to get an N7102 so I don't have to carry two phones all the time. I'm sure my GSM SIM card can work on N7102, and since I'm on a long term contract with Verizon, I'd like to know whether I switch to N7102 with Verizon?
It looks like Verizon allows people to use CDMA phones other than those provided by Verizon, but they have a page titled "Check Your Device" for people to check if their devices are eligible (as I'm not allow to post link here, please just google "check your device verizon" to get the page if you can help). Since I don't own an N7102 nor do I know anyone who owns one, I would really appreciate it if any owner of an N7102 here can help me check if N7102 is eligible for use on Verizon network. Thank you!

100% no. The N7102 doesn't support CDMA at all. Think you'd have more than a little bit of trouble getting Verizon to accept a foreign ESN even if it did.
Sent from my GT-N7100 using xda premium

thanks onslaught86
onslaught86 said:
100% no. The N7102 doesn't support CDMA at all. Think you'd have more than a little bit of trouble getting Verizon to accept a foreign ESN even if it did.
Sent from my GT-N7100 using xda premium
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that makes a lot of sense.

phenoxy said:
Greetings all, I'm a noob to the forum, although I've been reading a lot useful posts from xda.
I have a question here: is it possible for me to use N7102 on Verizon network? I currently use Verizon Droid RAZR and I also have an old GSM iphone 3GS on which I have a foreign SIM card. Since N7102 supports both GSM and UMTS with dual-SIM and dual-standby feature, I really want to get an N7102 so I don't have to carry two phones all the time. I'm sure my GSM SIM card can work on N7102, and since I'm on a long term contract with Verizon, I'd like to know whether I switch to N7102 with Verizon?
It looks like Verizon allows people to use CDMA phones other than those provided by Verizon, but they have a page titled "Check Your Device" for people to check if their devices are eligible (as I'm not allow to post link here, please just google "check your device verizon" to get the page if you can help). Since I don't own an N7102 nor do I know anyone who owns one, I would really appreciate it if any owner of an N7102 here can help me check if N7102 is eligible for use on Verizon network. Thank you!
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N719 might be the right one for you.
Mini Sim---GSM 900/1800
Micro Sim---CDMA/evdo
N719 is on sell in China.

N719 for China Telecom only?
LeoShi said:
N719 might be the right one for you.
Mini Sim---GSM 900/1800
Micro Sim---CDMA/evdo
N719 is on sell in China.
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I remember N719 is designed for China Telecom only, maybe I'm wrong.
If I'm correct, it should be using WCDMA network, are you sure it can be used on CDMA on USA carries?
Even so, I guess it may need to be flashed before it can be used on any USA CDMA network. Is that right?

[Q] is it possible to make SG grand dual sim to GSM + CDMA (any Hacks)?

hi i'm using CDMA sim past 6 years, and it is associated with my bussiness so i can't change number.
Mobile company said they can change to CDMA to GSM for postpaid only (not to prepaid with number portability).
But i want to know is there any technique or methods or hacks to make it work dual sim GSM + CDMA.
any suggestions greatly thankful (sorry for my english)
eshwar

AFAIK CDMA needs a different baseband frequency than GSM
Therefore its impossible
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