Develop Bugs

Read this before you ask questions about phone versions/ supported fequencies.

So basically I got fed-up with seeing so many questions about TP2 models and their supported frequencies.
I'm an American so most of this information is geared towards helping other Americans- but it may also be of use to people in other parts of the world.
If you aren't a big tech-wiz, READ THIS before you buy your Touch Pro 2.
Here is the low down:
There are two different prominent cell phone technology standards in the world today: GSM and CDMA.
Most of the world runs their 3G cellular networks on GSM. However some carriers such as Verizon, Sprint, Bell, and Telus work on CDMA.
GSM= Sim Card
CDMA= No sim card
-Note however that CDMA "world phones" have sim cards because they also include GSM tuners.
Here are the Mobile Telecommunications Standards that matter to you:
GENERATIONS:
1st Generation (1G):
~don't worry about it, only primitive cell phones operated on this standard.
2nd Generation (2G):
~here we go this is GSM!!! This is what matters
~this is also where current CDMA networks really started rolling out.
2.5G:
~EDGE, this is the GSM that you use if you aren't on 3G. EDGE is important, memorize the name!!!
3rd Generation 3G):
~now we are talking, UMTS (Universal Mobile Telecommunications System). In Europe UMTS may also be called "W-CDMA" although it is GSM (sim cards!!!) This is 3G that the Iphone was named after. It is GSM.
~EV-DO (Evolution Data Optimized), this is the 3G of CDMA. this has revisions such as EVDO rev "A" or "B" that can be considered 3.5G
3.5G:
~HSPA (High-Speed Packet Access)= HSDPA/HSUPA. The "D" in HSDPA stands for downlink, the additional "U" in HSUPA stands for uplink.
~ EV-DO revisions.
4G:
~LTE, blazing mobile broadband. This is GSM and what most of the world is migrating to, EVEN CDMA carriers.
~WiMAX. No sim card, because it is not a GSM technology. Think of it like Wi-Fi on steroids. Compare it to LTE like we can compare HSPA to EV-DO today. Understand WiMAX now?
Whew, now that we have all the standards explained, lets talk about what this means.....
DON'T BUY a phone and expect to get 3G on it UNLESS it SPECIFICALLY states that you can get 3G for your carrier on it.
Some common hints:
"European Version"= 3G for many carriers in Europe, EDGE everywhere else, nothing at all for CDMA.
"World Phone"= a CDMA phone that is also capable of GSM. Only capable of 3G (EV-DO) on the carrier that the phone is branded for. Will work on EDGE everywhere else for GSM carriers.
"US Version"= a GSM phone that works on AT&T's 3G network but NOT T-mobiles.
~~Phones that you buy from your carrier will work on your carrier's 3G bands. (Unless your carrier doesn't have 3G yet in your area)
JUST BECAUSE A PHONE SUPPORTS THE SAME BAND DOES NOT MEAN THAT YOU CAN GET 3G ON IT.
MANY 3G BANDS ARE SHARED, BUT ARE SLIGHTLY DIFFERENT. This means that even though carriers such as T-Mobile and AT&T share bands, the phones that support 3G on each are not interchangeable with carriers. EDGE, on the other hand, works interchangeably.
Lastly, 3G support and other wireless standard compatibilities have nothing to do with the software of your phone. You will never find a magic ROM that will enable 3G on a carrier that does not support the phone. It is all HARDWARE DEPENDENT.
Questions?
Also if you need more information, read the posts after this one. There are lots of smart people on xda-developers. I'm sure some will write additional information, clarify, or even correct something that I wrote.

somebody should sticky this, its useful for newcomers

skyler17 said:
2.5G:
~EDGE, this is the GSM that you use if you aren't on 3G. EDGE is important, memorize the name!!!
Click to expand...
Click to collapse
Not necessarily true. EDGE can actually technically be classed as 3G (though it almost always sits in the higher end of the 2.5G tier). 2.5G would more correctly refer to GPRS rather than EDGE, with EDGE being more of an enhancement to GPRS.

skyler17 said:
. . . .
Most of the world runs their 3G cellular networks on GSM. However some carriers such as Verizon, Sprint, Bell, and Telus work on CDMA.
GSM= Sim Card
CDMA No sim card
Click to expand...
Click to collapse
When it comes to PDA/WinMo phones "CDMA = No SIM card is false". There are actually a couple of CDMA phones with SIM cards including the Touchpro2.

HSPA is a catch all name for HSDPA and HSUPA, 3.5G techs.
The 3G implementation is UMTS.
If you are talking about worldwide use, EDGE is pretty much not used in the UK... O2 have it on a couple of base stations but its extremely rare, so here you just get:
1G - Analogue phones, Vodafone and O2 had analogue networks but they are now shut down.
2G - GSM with CSD (Circuit Switched Data - make a phone call for data) and HSCSD (High Speed Circuit Switched Data - basically make multiple phone calls and bond them, was only availible on Orange). O2 and Voda use both 900MHz and 1800MHz. Orange and Tmobile have no 900MHz license and use just 1800MHz. 3 Do not operate a 2G network and these days use Orange for coverage where they don't have their own network, they used to use O2...
2.5G - GPRS (General Packet Radio Service) This is the lowest speed you'll get on any network now, up to about 115kbps, on all four 2G networks, indicated by a G on the screen near the signal metre.
2.75G - EDGE (Enhanced Data Rates for GSM Evolution) initially capable of 236kbps, only O2 ever did anything with it, and they did very little with it, for all intents and purposes it is unused in the UK.
3G - UMTS (Universal Mobile Telecommunications Service). This is what is known as 3G in the UK. It uses WCDMA - yes, it is CDMA based, not TDMA as 2G GSM is. Capable of 384kbps, this is needed for video calls (which all UK networks support). Indicated by a 3 onscreen, all UK towns and cities are covered by this or better these days by all networks (advantage of a small country with dense population). All 5 big operators have 3G licenses. At the moment 3G means 2100MHz, Ofcom want to have some of Voda and O2's 900MHz allocation back and allow 3G on it. High frequencies mean short range, making the current band good for getting alot of transmitters (and hence capacity) in cities, but crap for covering rural areas with 3G, you need too many transmitters for cost effectiveness. If Ofcom reallocate some of the 900MHz band and allow 3G on it, it could massively improve 3G reception in rural areas.
3.5G - HSPA (HSDPA and HSUPA). Up to 14.4mbps down (Voda in trial at this speed) other networks 7.2mbps and 3.6mbps. Indicated by a H on screen. Will see this in most major towns and cities.

Say you have an European TP2, which, as we know, does not support AT&T's 3G. Will it support US HSDPA?

dementio said:
Say you have an European TP2, which, as we know, does not support AT&T's 3G. Will it support US HSDPA?
Click to expand...
Click to collapse
Nope, its all or nothing. Even though it supports the downlink band, since it is missing the uplink band it will not support US 3G.
It will give you EDGE however.

Let me get this straight - So TP2 is not a true "world phone"?

I'm a little green when it comes to 3G stuff, but please correct me if I am wrong...
Yes, you can put foreign SIM cards in US TP2's but not get 3G coverage in Europe. On the other hand from what I have read, European TP2's (even the unbranded ones) will not work with 3G is the US.
And if I am wrong... can someone please point me to a TP2 that will work on 3G networks in most of the world?
Or does one have to have two TP2's to enjoy 3G.. one for the US, and one for Europe, etc.?

quid246 said:
I'm a little green when it comes to 3G stuff, but please correct me if I am wrong...
Yes, you can put foreign SIM cards in US TP2's but not get 3G coverage in Europe. On the other hand from what I have read, European TP2's (even the unbranded ones) will not work with 3G is the US.
And if I am wrong... can someone please point me to a TP2 that will work on 3G networks in most of the world?
Or does one have to have two TP2's to enjoy 3G.. one for the US, and one for Europe, etc.?
Click to expand...
Click to collapse
Where have you heard that a NA TP2 won't work with 3G in EU?
The only limitation I'm aware of is a NA TP2 won't work w/ NA GSM 3G.

Oh SoS said:
Where have you heard that a NA TP2 won't work with 3G in EU?
The only limitation I'm aware of is a NA TP2 won't work w/ NA GSM 3G.
Click to expand...
Click to collapse
Until someone hacks it

I can't remember where I read it. But someone said if you wanted 3G in Europe, better to get a Euro unbranded model.
So perhaps this is under the assumption that it isn't hacked... not sure.
Slightly, off-topic Q but rather than start a new thread.... once a HardSPL is out for both the CDMA and GSM TP2's... will they effectively be "equal" devoces?
I really would like to pick-up a TP2 in the next few days... I like the VZ unit, but it's CDMA and since I travel quite a bit, really prefer and need more of a GSM phone, but don't like the TMO as no 3.5mm jack.

quid246 said:
I can't remember where I read it. But someone said if you wanted 3G in Europe, better to get a Euro unbranded model.
So perhaps this is under the assumption that it isn't hacked... not sure.
Slightly, off-topic Q but rather than start a new thread.... once a HardSPL is out for both the CDMA and GSM TP2's... will they effectively be "equal" devoces?
I really would like to pick-up a TP2 in the next few days... I like the VZ unit, but it's CDMA and since I travel quite a bit, really prefer and need more of a GSM phone, but don't like the TMO as no 3.5mm jack.
Click to expand...
Click to collapse
The Verizon unit already has international GSM bands unlocked, AND international (2100MHz 3G). If you've been a Verizon customer for 60 days or more you can call them up and get an unlock code for free and use any SIM card in your phone so you can get a cheap prepaid SIM and not pay the high Verizon roaming costs. There's also a small (I'd say around 25%) chance that the NA 3G bands will be found/unlocked, but at this point who really knows if they are there or not.

Actually the Telus CDMA TP2 supports the European 3G bands but not the American ones becuase technically you will be using it in North America on CDMA and outside America on GSM. So its the other way around

It seems that if you have the Sprint TP2 that it won't register at all on US GSM networks, but comes unlocked by default.
On Verizon (which I have) a simple phone call to support they'll give you the unlock code and you're good to go. I use an Orange (UK) Sim in mine just fine in the US and others in other forums have reported that using US SIM's from TMobile/AT&T work fine also in the US.
--chris

TP2 = best 'World' phone I've ever owned.
quid246 said:
I'm a little green when it comes to 3G stuff, but please correct me if I am wrong...
Yes, you can put foreign SIM cards in US TP2's but not get 3G coverage in Europe. On the other hand from what I have read, European TP2's (even the unbranded ones) will not work with 3G is the US.
And if I am wrong... can someone please point me to a TP2 that will work on 3G networks in most of the world?
Or does one have to have two TP2's to enjoy 3G.. one for the US, and one for Europe, etc.?
Click to expand...
Click to collapse
I have an unbranded HTC factory TP2, and it works in 3G mode anywhere I take it that has the 3G network... and I travel all over the US/Caribbean and back to EU/UK. Have not found one spot it hasn't worked (inlcduing some of the very obscure Carib countries), and I like the fact that it automatically picks up HS when within range without having to change any settings.
Just have to make sure that your provider gives you a 3G SIM (most of them are these days) and that you have the 3G service enabled on your account in the respective country.
Many people say they can't pick it up yet don't have it on their account, or think that their EU provider will automatically provide it as part of the roaming service... which is not a good assumption to make.

TyTanIc said:
I have an unbranded HTC factory TP2, and it works in 3G mode anywhere I take it that has the 3G network... and I travel all over the US/Caribbean and back to EU/UK. Have not found one spot it hasn't worked (inlcduing some of the very obscure Carib countries), and I like the fact that it automatically picks up HS when within range without having to change any settings.
.
Click to expand...
Click to collapse
3G in North America? I doubt that. The phone does not support North American 3G bands. Are you sure it was 3G in North America??

Man, this is all confusing... I swear somebody has to come up with an HTML table of what phones work with what and where and stickify it.

Can people just put this to bed already!!!
The Sprint (North America) TP2 is suppossed to be used on CDMA in the US and GSM worldwide, hence the GSM radio is unlocked for outside America GSM use. This is how it comes default. If that is so hard to grasp, then there is no hope for some, sadly.
As for the title, the TP2 is a world phone, it works in the US (and North Ameria) on CDMA and elsewhere unlocked on GSM. That to me is the true definition of a World phone from a U.S CDMA perspective (and especially moreso as this is the CDMA version).
To put it in perspective, a Sprint customer (in this case, moi) gets the best of CDMA in the U.S and when traveling to visit his sister in High Wycombe in the U.K (like i'll be doing this Autumm) gets to pop in a PAYG U.K sim in the same phone and use it while over there. This phone doesn't get any "worldlier" to me than this scenario!!
Is the O.P attempting to specifically define a dual mode CDMA/GSM-unlocked World phone as not world phone because it's locked by default from doing GSM in it's primary market which happens to be CDMA (and in this case Sprint)?
This is not rocket science folks, it really isn't.

LordLugard said:
Is the O.P attempting to specifically define a dual mode CDMA/GSM-unlocked World phone as not world phone because it's locked by default from doing GSM in it's primary market which happens to be CDMA (and in this case Sprint)?
Click to expand...
Click to collapse
Point taken. It's just that with that same Sprint phone (correct me if I am wrong), you can't travel to Canada pop in a Rogers SIM card and get Rogers 3G.
Wouldn't the phone want to swing towards it's CDMA cousin, Telus or Bell?

mmmhhh86 said:
3G in North America? I doubt that. The phone does not support North American 3G bands. Are you sure it was 3G in North America??
Click to expand...
Click to collapse
AT&T 3G runs on 850/1900 GSM, the TP2 supports both of those bands, how would it not work with 3G on AT&T in the US?
T-Mobile runs 3G on 1700/2100 GSM bands, both of which aren't included on the TP2, as far as my research has lead me to believe.

Basically while it may be a quad band GSM phone, it is only a dual band 3G device. It comes in two flavours - UMTS 900+2100 or UMTS 1900+850
The 900/2100 version is far more common than 850/1900

.mak said:
AT&T 3G runs on 850/1900 GSM, the TP2 supports both of those bands, how would it not work with 3G on AT&T in the US?
T-Mobile runs 3G on 1700/2100 GSM bands, both of which aren't included on the TP2, as far as my research has lead me to believe.
Click to expand...
Click to collapse
It supports those bands for HSDPA CDMA not GSM 3G
Network 3G EVDO Rev A (800/1900 MHz), UMTS/HSPA (2100 MHz), GSM/ EDGE (850/900/1800/1900 MHz)
This is the Telus version btw

quid246 said:
Point taken. It's just that with that same Sprint phone (correct me if I am wrong), you can't travel to Canada pop in a Rogers SIM card and get Rogers 3G.
Wouldn't the phone want to swing towards it's CDMA cousin, Telus or Bell?
Click to expand...
Click to collapse
"it Depends"
The US CDMA phone operates in 3 modes.
1 CDMA Only
2 GSM Only
3 'Global' (whatever it can find).
If you have it in Global it will generally take the CDMA local carrier over anything else. However, not always. I've had mine switch to GSM for a bit then go back to CDMA. But mine is Verizon and unlocked so it works everywhere in the US and I also have a UK sim card in it. So I'm a little 'different'.
But, in any case, you can tell the phone which mode to use if you want. All upto you.
--chris
(verizon TP2)

here we go again... (tp2 3g na)
"I have an unbranded HTC factory TP2, and it works in 3G mode anywhere I take it that has the 3G network... and I travel all over the US/Caribbean and back to EU/UK. Have not found one spot it hasn't worked (inlcduing some of the very obscure Carib countries), and I like the fact that it automatically picks up HS when within range without having to change any settings."
So, maybe he's wrong. But either way...
You wanna know why this keeps coming up again and again?
(not because we're all dumb and thick headed, which we may very well be)
But,
Because we just have trouble imagining them hardware "band amplifier" hobbling the hardware when it's so much easier to do it somewhere in firmware.
We all know that the less you fiddle with the hardware for multi-region functionality the less you have to fiddle with the production line and fiddling with the production line is the Last Thing a manufacturer wants to do.
Someone even once said that there wasn't room in the Rhodium platform for quad band data support. But now we're expecting the tilt 2 to do just that.
So, all protestations aside, those of us who paid ~700 us clams for this beauty, and who like the kbd layout.
And who have like me (as quite the Early Adopter), forked out for an sx56, sx66, 8135, x7510((quad band data)
Just feel a leetle wee bit of a sense, dare I say it, of Entitlement for the TP2 to be enabled into a fully world wide phone.
So we keep hunting, and digging, and dreaming, and .... posting.....

well here is my two cents i have the original unlocked euro version of the tp2 and all i get in the us it edge. it is really impossible to get 3g in the US (2100) because this version of the phone literally does not have the attena for it. and so that you can see all the different types of tp2s and the technical and physical differences between them here is a link: http://pdadb.net/index.php?m=pdacom...&id3=1792&id4=1829&id5=1766&id6=1989&id7=1751

drae1980 said:
well here is my two cents i have the original unlocked euro version of the tp2 and all i get in the us it edge. it is really impossible to get 3g in the US (2100) because this version of the phone literally does not have the attena for it. and so that you can see all the different types of tp2s and the technical and physical differences between them here is a link: http://pdadb.net/index.php?m=pdacom...&id3=1792&id4=1829&id5=1766&id6=1989&id7=1751
Click to expand...
Click to collapse
3g in the USA must be on the 1700 band then, as thats the only gsm band that the euro version doesn't support.
Euro version
GSM850, GSM900, GSM1800, GSM1900, UMTS900, UMTS2100
TMOUS version
GSM850, GSM900, GSM1800, GSM1900, UMTS1700, UMTS2100

Anyone know of a good site to order a prepaid SIM card? I plan on using my VZW TP2 in Spain and France. I was also wondering if I should or could disable data and use my TP2 with Garmin XT so I don't get nailed for data usage. Your thoughts would be appreciated...
Mugs

Telus TP2 Radio(s)

Exactly what cellular radios does this phone [Telus TP2] have?
My carrier [Telus] has recently completed their 3G overlay, and I'm still showing "EV".
Should I be talking to them about fixing this, or...?
It was (is?) my understanding that this phone was fully 3G capable.

Can someone help me with this?
As far as I can tell, my phone should support the Telus overlay of HSPA on their CDMA network, however I'm showing "EV" an my network type on the notification bar.
I visited a Telus store, and talked to a rep, who just babbled to me about how my SIM was "registered" as a CDMA phone, and therefore I couldn't use HSPA.
>_>
Thoughts?
EDIT: The rep also fed me this convoluted bullsh*t about how when I'm roaming, I'll be able to be on HSPA networks, so I'll get better bandwidth roaming than on my home network...

Wow no one knows the answer to this?
I've searched, and there's no answer, per se, just descriptions of Telus' technology and the antennae in the TP2, which seems to indicate that the TP2 should be able to get on the Telus HSPA network...

I have a SIM-unlocked Telus Touch Pro2 I bought off Craigslist, figuring it'd be good to go when the HSPA network rolled out (Only four months later!). As I understand it, the telus model can make and receive calls on quad-band GSM frequencies, but only use EDGE speeds for data. Has to do with the firmware for the chipset inside the phone. The only HSPA 3G band the phone can use is 2100 Mhz, which is the bad used in Europe, not Canada. It's a major piss-off, especially when a month ago the stores made this out to be the top-of-the-line phone, perfect for ever and ever.
It would seem that should Telus decide to plug in some firmware upgrades, they could activate the new 3G bands, but why bother? We've already signed away our souls to the company.
Who knows, maybe they'll fix it when they release Windows 6.5 for our rig. Because that's on the top of the to-do list, right?

Well there are new radios that we could flash...would that change anything?

Now I may be misinformed but I think that the Telus version is a CMDA phone with GSM capabilites on some frequencies. I do not think it will work on HSPA in Canada as they use different frequencies (850 and 1900). This is why so many people were waiting for the ATT version to come out as it uses those frequencies.
Remember GSM does not equal 3G.

What I would like to know is whether the distinction between 3G and GSM is on the hardware side, firmware side, or software side. Telus would have you assume it's all the hardware's fault, but I'm not sure on that one.

From everything I have read its the chip in the phone that isnt programmed/capable of doing the frequencies required. It may actually be a second chip but I cant confirm that. Other posts have stated that there wont be a software fix to "unlock the frequencies" needed.
GSM is a cellular line and 3G is a data connection.

I just purchased an At&t Tilt 2 unlocked for use on Telus 3G+ network. The Telus Touch Pro 2 is a CDMA , Quadband GSRM and UMTS/HSDPA 2100. The Telus TP2 will only work with EVDO data on the Telus network. If you unlock it for use with Rogers it will work on GSRM with Edge data. That is why I have ordered the At&t Tilt 2. Unfortunately Telus won't honour my unlimited data plan and say it is only for EVDO and that I have to change to one of their current plans to have HSDPA. Like all of the networks, they get your money one way or the other. I'm pleased that with the Tilt 2 I am free to switch providers here in Canada and still get 3G as well as when I travel in Europe.

[Q] GSM or CDMA Desire?

Hi all, Firstly iv got a O2 UK branded desire. Iv already rooted it and im now running leedriod2.2 but my problem is I wish to also install the psfMod But im confused at which file I need to download, as the titlle suggests I need to know if its GSM or CDMA or how can I find this out. Thanks in advance.

suprvibes said:
Hi all, Firstly iv got a O2 UK branded desire. Iv already rooted it and im now running leedriod2.2 but my problem is I wish to also install the psfMod But im confused at which file I need to download, as the titlle suggests I need to know if its GSM or CDMA or how can I find this out. Thanks in advance.
Click to expand...
Click to collapse
CDMA has no SIM, GSM does. Your phone is GSM.

Oh so thats the difference lol, I feel silly now. thanks for the reply.

Kalavere said:
CDMA has no SIM, GSM does. Your phone is GSM.
Click to expand...
Click to collapse
Im almost certain this is wrong.
Its to do with the type of network you operator uses.
Can be found on the HBOOT Screen.
Bravo = GSM
Bravoc = CDMA

Aldasa said:
Im almost certain this is wrong.
Its to do with the type of network you operator uses.
Can be found on the HBOOT Screen.
Bravo = GSM
Bravoc = CDMA
Click to expand...
Click to collapse
Well yes, it's down to the cellular network used, codecs used to transmit the data, different frequency and network structure. But in the most absolute laymans terms, GSM has a removable SIM card and CDMA doesn't.
He wanted to know what file to download for his Desire, not a comparative on the different standards adoped by each technology. So I gave him the most basic answer so he could go ahead and install the program to his phone, makes sense don't you think?

Kalavere said:
Well yes, it's down to the cellular network used, codecs used to transmit the data, different frequency and network structure. But in the most absolute laymans terms, GSM has a removable SIM card and CDMA doesn't.
He wanted to know what file to download for his Desire, not a comparative on the different standards adoped by each technology. So I gave him the most basic answer so he could go ahead and install the program to his phone, makes sense don't you think?
Click to expand...
Click to collapse
well i have to give u right the CDMA is only operating in
2G Network CDMA 800 / 1900
3G Network CDMA2000
GSM in
2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 900 / 2100
4G in
2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 900 / 1700 / 2100
here is a little about it
In cellular service there are two main competing network technologies: Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA). Cellular carriers including Sprint PCS, Cingular Wireless, Verizon and T-Mobile use one or the other. Understanding the difference between GSM and CDMA will allow you to choose a carrier that uses the preferable network technology for your needs.
The GSM Association is an international organization founded in 1987, dedicated to providing, developing, and overseeing the worldwide wireless standard of GSM. CDMA, a proprietary standard designed by Qualcomm in the United States, has been the dominant network standard for North America and parts of Asia. However, GSM networks continue to make inroads in the United States, as CDMA networks make progress in other parts of the world. There are camps on both sides that firmly believe either GSM or CDMA architecture is superior to the other. That said, to the non-invested consumer who simply wants bottom line information to make a choice, the following considerations may be helpful.
Coverage: The most important factor is getting service in the areas you will be using your phone. Upon viewing competitors' coverage maps you may discover that only GSM or CDMA carriers offer cellular service in your area. If so, there is no decision to be made, but most people will find that they do have a choice.
Data Transfer Speed: With the advent of cellular phones doing double and triple duty as streaming video devices, podcast receivers and email devices, speed is important to those who use the phone for more than making calls. CDMA has been traditionally faster than GSM, though both technologies continue to rapidly leapfrog along this path. Both boast "3G" standards, or 3rd generation technologies
also known as CDMA2000, is CDMA's answer to the need for speed with a downstream rate of about 2 megabits per second, though some reports suggest real world speeds are closer to 300-700 kilobits per second (kbps). This is comparable to basic DSL. As of fall 2005, EVDO is in the process of being deployed. It is not available everywhere and requires a phone that is CDMA2000 ready.
GSM's answer is EDGE (Enhanced Data Rates for GSM Evolution), which boasts data rates of up to 384 kbps with real world speeds reported closer to 70-140 kbps. With added technologies still in the works that include UMTS (Universal Mobile Telephone Standard) and HSDPA (High Speed Downlink Packet Access), speeds reportedly increase to about 275—380 kbps. This technology is also known as W-CDMA, but is incompatible with CDMA networks. An EDGE-ready phone is required.
In the case of EVDO, theoretical high traffic can degrade speed and performance, while the EDGE network is more susceptible to interference. Both require being within close range of a cell to get the best speeds, while performance decreases with distance.
Subscriber Identity Module (SIM) cards: In the United States only GSM phones use SIM cards. The removable SIM card allows phones to be instantly activated, interchanged, swapped out and upgraded, all without carrier intervention. The SIM itself is tied to the network, rather than the actual phone. Phones that are card-enabled can be used with any GSM carri
The CDMA equivalent, a R-UIM card, is only available in parts of Asia but remains on the horizon for the U.S. market. CDMA carriers in the U.S. require proprietary handsets that are linked to one carrier only and are not card-enabled. To upgrade a CDMA phone, the carrier must deactivate the old phone then activate the new one. The old phone becomes useless.
Roaming: For the most part, both networks have fairly concentrated coverage in major cities and along major highways. GSM carriers, however, have roaming contracts with other GSM carriers, allowing wider coverage of more rural areas, generally speaking, often without roaming charges to the customer. CDMA networks may not cover rural areas as well as GSM carriers, and though they may contract with GSM cells for roaming in more rural areas, the charge to the customer will generally be significantly higher.
International Roaming: If you need to make calls to other countries, a GSM carrier can offer international roaming, as GSM networks dominate the world market. If you travel to other countries you can even use your GSM cell phone abroad, providing it is a quad-band phone (850/900/1800/1900 MHz). By purchasing a SIM card with minutes and a local number in the country you are visiting, you can make calls against the card to save yourself international roaming charges from your carrier back home. CDMA phones that are not card-enabled do not have this capability, however there are several countries that use CDMA networks. Check with your CDMA provider for your specific requirements.
According CDG.org, CDMA networks support over 270 million subscribers worldwide, while GSM.org tallies up their score at over 1 billion. As CDMA phones become R-UIM enabled and roaming contracts between networks improve, integration of the standards might eventually make differences all but transparent to the consumer.
The chief GSM carriers in the United States are Cingular Wireless, recently merged with AT&T Wireless, and T-Mobile USA. Major CDMA carriers are Sprint PCS, Verizon and Virgin Mobile. There are also several smaller cellular companies on both networks.

janielsen said:
well i have to give u right the CDMA is only operating in
2G Network CDMA 800 / 1900
3G Network CDMA2000
GSM in
2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 900 / 2100
4G in
2G Network GSM 850 / 900 / 1800 / 1900
3G Network HSDPA 900 / 1700 / 2100
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Click to collapse
I know this, I don't really care either if you'll excuse my bluntness. The question was simple enough and I gave a very simple answer.

Kalavere said:
I know this, I don't really care either if you'll excuse my bluntness. The question was simple enough and I gave a very simple answer.
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Click to collapse
i dont excute anything
im just pointing out that u are right
an i explaine to the person ho ask fore it
what an how about GSM an CDMA
it has nothing todo whit u or ur answer

In most cases I've seen, GSM are European variants of the device and CDMA are usually US devices.
That is just from my own experience though, so I could be wrong..
Sent from my GT-P1000 using XDA Premium App

Kalavere said:
CDMA has no SIM, GSM does. Your phone is GSM.
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Click to collapse
o yeah?? how comes mine have sim card slots?
yess the CDMAs ussualy not having sim card slots we must injection the number to the phone, but mine have the slots.
for not trying for making another thread, i also want a help from you guys here.
my phones are HTC desire ADR6275,
android ver 2.2
baseband version (also called radio ver) 2.15.00.09.88
kernel 2..6.32.21-g7a207a4
build number 2.11.573.5 CL325935
PRI version 1.70_027
i have trouble for read and access my SIM card for reading phone book and also having call from my SIM card.
is it because the radio version or the OS version or ??

[Q] @ USA Users

So after having bought and upgraded the phone for the gf and having seen the amazing display and speed, I'm considering getting one for myself (even though I'm a bit hesitant due to the battery life and:
From what I've seen, it looks like this phone is compatible with:
Metro PCS for and T-Mobile for 3G and Sprint for 4G, I think. (US carriers)
Because I'm really green when it comes to this, I'd like to know: GSMArena lists the 3G network as HSDPA 2100 while Metro PCS for and T-Mobile is listed as carrying the 1900/2100 bands for the 3G network, but doesn't specify what type (eg HSDPA, EV-DO, etc). Does this matter? Like, would the phone not work even though it can tune into the 2100 band because of type?
While on the subject, does anyone know whether or not they'll add more LTE bands to USA carriers? The only US 4G carrier I saw that carries the 800 band is Sprint, which I heard wasn't very good and also don't have compatible 3G bands.
Also, the 2G network (which I'm assuming is voice calls only) for the phone is listed as operating under CDMA 800/1900 bands. Would these bands, the CDMA, work for US carriers? or would it need GSM?
Thanks!
PS For USA users who've managed- how's the phone work with USA carriers?