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Purpose of Unlocking baseband of Nexus One?

I never fully unlocked any of my iPhones...but what purpose would unlocking the baseband of the Nexus One serve? Is it only meant to be used by people that didn't get the Nexus unlocked?
Basically what I'm wondering is if there's a possibility of altering the wave lengths of the baseband to make use of AT&T's 3G. It would theoretically be possible to reprogram the radio to send/receive on the different wave length...but I'm absolutely not programmer-savvy enough to do it.
I was also thinking something along this line: A company should create a case that integrates an AT&T-capable radio that would work with an app they design to basically enable 3G over AT&T. It would definitely be possible...

hotleadsingerguy said:
I never fully unlocked any of my iPhones...but what purpose would unlocking the baseband of the Nexus One serve? Is it only meant to be used by people that didn't get the Nexus unlocked?
Basically what I'm wondering is if there's a possibility of altering the wave lengths of the baseband to make use of AT&T's 3G. It would theoretically be possible to reprogram the radio to send/receive on the different wave length...but I'm absolutely not programmer-savvy enough to do it.
I was also thinking something along this line: A company should create a case that integrates an AT&T-capable radio that would work with an app they design to basically enable 3G over AT&T. It would definitely be possible...
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its the BOOTLOADER you can unlock, not the baseband. The baseband doesnt need unlocking because the phone is already SIM unlocked.
Also no baseband unlock can make your antennae support new frequencies. this is a hardware limitation.

melterx12 said:
its the BOOTLOADER you can unlock, not the baseband. The baseband doesnt need unlocking because the phone is already SIM unlocked.
Also no baseband unlock can make your antennae support new frequencies. this is a hardware limitation.
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Well I knew nothing can make an antenna support new frequencies, but my question was whether the radio could support the frequencies but was only locked out of them.
I was just wondering if that were the case and if so, if it would be possible to remove that lock.

melterx12 said:
its the BOOTLOADER you can unlock, not the baseband. The baseband doesnt need unlocking because the phone is already SIM unlocked.
Also no baseband unlock can make your antennae support new frequencies. this is a hardware limitation.
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1. Agreed
2. The radio they use in the N1 supports the AT&T 3G frequencies, but it's locked out on the chip. That's why there's speculation that someone will hack a way to get 3G enabled on the device, but it will have to be modified somehow. (not physically, it's similar to how the wireless N is disabled on the HD2)
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Someone will come along with an unlock for the freq. eventually if it's possible, I'd assume it would be, but you never know.

The only reason I made this topic was because there was another topic named "Unlocking baseband..." and I figured they used the correct terminology.
I knew unlocking the bootloader is the common thing, but I figured someone had actually figured out how to unlock the baseband to the point where they could unlock and use the AT&T 3G frequencies. That's why I came up with the questions.

JareduPS said:
1. Agreed
2. The radio they use in the N1 supports the AT&T 3G frequencies, but it's locked out on the chip. That's why there's speculation that someone will hack a way to get 3G enabled on the device, but it will have to be modified somehow. (not physically, it's similar to how the wireless N is disabled on the HD2)
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Someone will come along with an unlock for the freq. eventually if it's possible, I'd assume it would be, but you never know.
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Where did u get the info that the At&t radio frequency is just locked on nexus one? I'm gonna call shinanigans on that one.
A) There is no way that google would lock extra frequencies....it would just help them to get at&t customers......there is no logic there what so ever.
B) I don't believe there is any chip that supports both TMobile and At&t 3g frequencies in production. Therefore this is not even possible

Svegetto said:
Where did u get the info that the At&t radio frequency is just locked on nexus one? I'm gonna call shinanigans on that one.
A) There is no way that google would lock extra frequencies....it would just help them to get at&t customers......there is no logic there what so ever.
B) I don't believe there is any chip that supports both TMobile and At&t 3g frequencies in production. Therefore this is not even possible
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Actually sometime after creating this topic I found another with a long list of spec sheets and such and they found out that the radio *does* support the frequencies but they believed that only the T-Mobile frequencies are amplified (meaning the AT&T frequencies would be fairly useless)

[Q] Flash to Rogers in Canada

Hey all I'm looking for some help on a quick matter. I just sol my HD2 to someone in Canada. Hes using Rogers telecom but primarily just wants to use it as a Android phone on that network. I flashed it to a Energy Rom and the 2.12 radio. Will I need to do anything else on my end to make sure it works when he opens the box? Any creative suggestions are appreciated and yes I did do a search didn't find out anything outside of 40 pages of what I am not trying to figure out.

Is it SIM unlocked? It will not work on Rogers, or any other network for that matter if it hasn't been SIM unlocked. Other then that, he will need to setup the APN settings that Rogers uses, but all in all it should work.

Yup
I installed Cotulla HSPL2 to unlock it. I believe that should be sufficient its just a matter of him putting in the correct APN numbers now I think?

wrong, hspl does not unlock the network.
you need to buy a code online or ask t mo if you have a contract.
also, does your buyer know there will be no 3g?

?
Me under contract? Probably, but my account has me listed on a different phone the HD2 isn't on there anymore.
Now you say wrong but no details on how to correct the problem. Can you be a little more forthcoming on where I should go fix this.

Nevermind I contacted TMO and they are unrooting the phone for free and will send me the code in the few days.

*shiver* unrooting...anyways, yeah you have to SIM unlock it, and HardSPL most definately doesn't do that. And also, the 3G bands that Rogers uses are different from that of T-Mobile, so he will not get 3G data, only EDGE and GPRS.

Thats what he wanted I figured he did the research about it working on Rogers.

BTW why shiver about unrooting? It seems like it opens it up to more stuff?

Because the HD2 isn't "rooted" in the first place. Both Android and the iPhone have dumbed down the masses so that jailbreak and root are commonplace terms that people apply to EVERYTHING in the smartphone sector, and it aggravates me.

ashasaur said:
jailbreak and root are commonplace terms that people apply to EVERYTHING in the smartphone sector, and it aggravates me.
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hehe with that and the bastardisation of the word "fail",society is collapsing as we watch!

Help im confused :)

Hey guys so I switched from iPhone to HTC HD2. And i got a little bit confused at one point. How do I use this phone with other carriers other than t-mobile? I have AT&T. After Doing some research I figured that I have two choices one is sim unlock which im not doing cause I gotta pay. And the second choice is radio flash? So Im confused right here. I have US t-mobile HD2, i put 2.08HSPL and have wp7 rom on it. Can I still do radio flash? If so how can I do this? And if ill do it, i will be able to use 3g data? Im sorry if im asking about some obvious things but im tottaly new to HTCs. Thank you.

Welcome to the HD2 world. I don't know specifically about the US models but in Europe, you need to sim unlock to use a locked phone on a different carrier.
Using different radio versions allows you to test and find one that offers the best balance of battery life and signal quality for your location and usage pattern.
With regards to data speed, those would be dependent on your carrier as unlocking gives you access to all the HD2s capabilities.
If I'm wrong in any of these someone will chime in soon. Have you tried using the search and looking the the very details FAQ threads? Have fun!
Sent from my HTC HD2 via XDA app

Currently no free sim unlock. Buy a code online or get from t mobile.
Changing radio has no effect on network lock.
Regarding data speeds, it depends what network you are on. Example a tmous phone on at &t wont get 3g, cos the hardware bands don't match.

Flashing a radio will not allow you to use another carrier. You gotta pay for that privilege.

Hd2 on at&t

I have a hd2 tmobile usa version, i need a At&t friendly Nand rom. Whats the best rom out there for At&t????
Sent from my Desire HD using XDA App

as far as I know any NAND Android ROM should work on AT&T as it is not the ROM that controls this but a combination of you sim card, APN settings, and you having your HD2 sim unlocked. Wait for more replies though as I do not use AT&T and it might actually be a ROM out there that has certain things adjusted for AT&T, but what that might be I do not know.

This is true, the ROM does not control the radio. There are methods of flashing the radio to a different version, one that may work for the AT&T 3G bands. I am looking them up, but that is how you would flash the device to change the radio.
Hardware wise, the GSM module does support all world wide bands but what makes then different from one HD2 from one carrier ot another is the firmware version that is used in the phones that make them work on the network's bands. Correct me if i am wrong though.

TKETZ196 said:
This is true, the ROM does not control the radio. There are methods of flashing the radio to a different version, one that may work for the AT&T 3G bands. I am looking them up, but that is how you would flash the device to change the radio.
Hardware wise, the GSM module does support all world wide bands but what makes then different from one HD2 from one carrier ot another is the firmware version that is used in the phones that make them work on the network's bands. Correct me if i am wrong though.
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Untrue my friend, the T-Mobile HD2 only supports the bands used by T-Mobile for 3G. If you sim unlock the T-Mobile HD2 you can use the device with other carriers but you will only get Edge for a data signal as the hardware only supports the T-Mobile 3G bands. There is a model of the HD2 that supports a different 3G band the same ones AT&T uses in the US, it is the Australian model that Telstra a Australian cell carrier released as they use the same bands as AT&T. go to "Official HD2 T9193 (Telstra 850Mhz) Discussion Thread" and you can learn more about it. I also saw your other post in another thread about trying to help your friend out getting 3G on his HD2 using AT&T. Unless he is willing to buy a Telstra HTC HD2 T9193 or have his T-Mobile HTC HD2 T8585 worked on to switch out the hardware for the hardware in the T9193 then he will never getb 3G with AT&T.

Just to answer your question, every rom is an AT&T friendly ROM, meaning, they'll allow you to talk, text and surf the internet.
What you DONT have is AT&T 3G on your tmous HD2. You'll be stuck with EDGE speed.

Thank you all 4 your help,greatly apreciated!! I'm in puerto rico where tmobile is still on Edge. But for some reason tmobile is still alot faster when it comes to receiving & sending MMS than At&t on this phone. Currently using Coredroid 1.5
Sent from my Desire HD using XDA App

its interesting they would use different hardware GSM modules for the slightly different models. I would think the radio firmware version woudl take care of that. Thanks for clarification. I assumed that all GSM modules would be built the same way.

Sadly they are not, this in my opinion is just cellular carriers trying to keep you locked to their networks cause the know most people don"t want to have to buy another device when changing carriers if they already have a good device. So they make it were branded devices can only utilize high speed data with it's intended carriers network. I think this is unfair to consumers, but again just my opinion.

T-Macgnolia said:
Sadly they are not, this in my opinion is just cellular carriers trying to keep you locked to their networks cause the know most people don"t want to have to buy another device when changing carriers if they already have a good device. So they make it were branded devices can only utilize high speed data with it's intended carriers network. I think this is unfair to consumers, but again just my opinion.
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I think there is technical reason. The various carriers have very different technologies. Even AT&T uses a different 3G network than T-Mobile, despite the fact that both are GSM. Sprint and Verizon use non GSM technologies that are even more different. When a device manufacturer makes a certain model, there is only so much room inside, and unless one wants a really thick and heavy device, a choice has to be made as to which hardware goes into the phone.
I'm not saying that they don't want you to stay on their network - they do, which is why they have those 2 year contracts in exchange for buying a discounted phone. But I don't think that is why the hardware is different.

stevedebi said:
I think there is technical reason. The various carriers have very different technologies. Even AT&T uses a different 3G network than T-Mobile, despite the fact that both are GSM. Sprint and Verizon use non GSM technologies that are even more different. When a device manufacturer makes a certain model, there is only so much room inside, and unless one wants a really thick and heavy device, a choice has to be made as to which hardware goes into the phone.
I'm not saying that they don't want you to stay on their network - they do, which is why they have those 2 year contracts in exchange for buying a discounted phone. But I don't think that is why the hardware is different.
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Point taken
I would go further with the discussion but I do not want to hijack this thread.

[Q] AT&T LG G2 unlocked to use on T-Mobile Carrier Rom/Root Questions

Hey Guys,
So, I bought a AT&T LG G2 phone (I had a gift card at Best Buy- they don't carry T-Mobile). I heard that AT&T had the same towers so it's easier to work with an unlocked phone through them, so I bought it there instead from T-Mobile itself.
However, now I realized I don't have some of the features I would have on a T-mobile LG G2, such as my wifi calling, etc. Now, since the phone is unlocked (and I just got it rooted), would installing a T-Mobile rom affect my phone in any way, good or bad? Should I only use AT&T roms? How would I use T-mobile app services?
I searched google for 2 days and couldn't find anything relevant to my question. I've used this site a lot in the past year-two for rooting and such. Thank you guys in advance for continuing to support open development for android.

Wondering the same, about to switch to tmobile.

*Answer solved through own testing
trh1341 said:
Wondering the same, about to switch to tmobile.
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Well, seems like no one has an answer to it...
Anyway, I went ahead and bought the phone. Since I do a lot of testing and rooting myself, this was the first time working on this type. I'm glad you posted, because I would have just forgotten about it now that I've solved the question I had... However, I figure it'd help in the future in case someone is also wondering the same.
Now, with that all stated... down to the answer.
If you bought an AT&T phone, and do an unlock code to use it on another carrier (such as T-mobile since they use the same towers), the rom you MUST use are the AT&T roms... NOT the T-mobile roms. The problem is, when you buy a AT&T phone, unlock it, and root your device to use another rom, it will not be compatible with T-Mobile roms because of the image files, etc. So yes- you will be losing all the features a T-Mobile rom would have such as wi-fi calling, etc...
However, a way to go about this (and it won't work with ALL the features that comes in a T-Mobile phone/rom), is to install a AT&T rom of your choice without all the crappy AT&T bloatware that you can't even use, and go to the T-Mobile section to look for an APK version of the files. Most of the time, T-Mobile roms will also remove the bloatware, however, some developers are kind enough to provide the bloatware APK files in case users would like to have certain one of them features, such as WiFi Calling.
So, that's how I did it, and it's working good.
PS- One last thing, you may have trouble going on the internet or playstore when you're unlocked to a different carrier. All you need to do is find the APN settings for your carrier. So in this case, I bought an AT&T phone, bought unlock code to use on my carrier T-Mobile, and got the T-Mobile APN settings set up, reboot, and I get all my 4G data, etc. You can get this by calling T-Mobile. Just say, you bought an unlocked phone and can't access data, internet, etc, and was told to set up a APN. Or, you can use google. :good:
Hope I helped everyone else out there!!

johnnyjrmoua said:
Hope I helped everyone else out there!!
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So, would I be correct in stating that you will only get 4G in areas where it is offered @ 1900 MHz? What about 2100 MHz? Otherwise you will only get 3G HSPA+? As you can tell I'm a bit confused about compatibility between networks. According to wikipedia they will be doing away with 1900 MHz 4G by 2015. I'm trying to decide if it's worth buying an AT&T or Verizon phone to use on the T-Mobile pre-paid network because it seems the T-Mobile phones are not getting very much development.

johnnyjrmoua said:
Well, seems like no one has an answer to it...
Anyway, I went ahead and bought the phone. Since I do a lot of testing and rooting myself, this was the first time working on this type. I'm glad you posted, because I would have just forgotten about it now that I've solved the question I had... However, I figure it'd help in the future in case someone is also wondering the same.
Now, with that all stated... down to the answer.
If you bought an AT&T phone, and do an unlock code to use it on another carrier (such as T-mobile since they use the same towers), the rom you MUST use are the AT&T roms... NOT the T-mobile roms. The problem is, when you buy a AT&T phone, unlock it, and root your device to use another rom, it will not be compatible with T-Mobile roms because of the image files, etc. So yes- you will be losing all the features a T-Mobile rom would have such as wi-fi calling, etc...
However, a way to go about this (and it won't work with ALL the features that comes in a T-Mobile phone/rom), is to install a AT&T rom of your choice without all the crappy AT&T bloatware that you can't even use, and go to the T-Mobile section to look for an APK version of the files. Most of the time, T-Mobile roms will also remove the bloatware, however, some developers are kind enough to provide the bloatware APK files in case users would like to have certain one of them features, such as WiFi Calling.
So, that's how I did it, and it's working good.
PS- One last thing, you may have trouble going on the internet or playstore when you're unlocked to a different carrier. All you need to do is find the APN settings for your carrier. So in this case, I bought an AT&T phone, bought unlock code to use on my carrier T-Mobile, and got the T-Mobile APN settings set up, reboot, and I get all my 4G data, etc. You can get this by calling T-Mobile. Just say, you bought an unlocked phone and can't access data, internet, etc, and was told to set up a APN. Or, you can use google. :good:
Hope I helped everyone else out there!!
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hey johnny, so you were able to get wifi calling feature on at&t branded lg g2 unlocked?

AT&T phone switch to T mobile Wifi calling do not work
trh1341 said:
Wondering the same, about to switch to tmobile.
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Bought phone from ebay, it is an AT&T phone unlocked and want to use for T-mobile./ With T-mobile network I have to use wifi calling features in order to use in the house.
Could you please explain me how and how much it cost to get wifi calling feature in LG G2 ?