Database Users

Is HSDPA/UMTS band a software issue?

Hi guys, I don't know if this is a basic question but I have to ask it since I haven't find an answer yet...
Can I modify the HSDPA/UMTS band via ROM or SPL update?
I bougth a HTC T-mobile myTouch (1700/2100 MHz bands, UMTS/HSDPA) but later I realized that here in CHILE my provider uses the 850/1900 band for 3g .
So, can I do somethig to make it work here or is it a matter of hardware?
Thanks

birutilla said:
Hi guys, I don't know if this is a basic question but I have to ask it since I haven't find an answer yet...
Can I modify the HSDPA/UMTS band via ROM or SPL update?
I bougth a HTC T-mobile myTouch (1700/2100 MHz bands, UMTS/HSDPA) but later I realized that here in CHILE my provider uses the 850/1900 band for 3g .
So, can I do somethig to make it work here or is it a matter of hardware?
Thanks
Click to expand...
Click to collapse
No you cant change ur radio bands with software, its a hardware issue and im afraid your stuck with what you got, even flashing a new radio wont change things . . . sorry

it's too different versions of the qualcomm cpu's which makes the band difference
it's hardcoded inside the cpu

You should have bought the Canadian/Rogers version of the phone.
Fvcking HTC builds 3 versions of the phone (mytouch, rest of world, Canada) and people like you and me get fvcked. We have to pay an extra $150 to get the canadian version.
Let it be a lesson: do NOT buy HTC! Acer, Dell, Apple ... they all build phones that work everywhere. NOT HTC.

Rudegar said:
it's too different versions of the qualcomm cpu's which makes the band difference
it's hardcoded inside the cpu
Click to expand...
Click to collapse
Actually the CPU (Qualcomm MSM7201a) is capable of supporting five different UMTS frequency bands, however only three at once. Those bands again are indeed preset by the built-in RF chips, so there is no chance of changing frequencies.
Here's the datasheet of the MSM7200 (identical to the MSM7201a in terms of RF support) with an overview of possible RF chip configurations at the bottom of page 3: http://www.ent.eet-china.com/PDF/2007FEB/DTCOL_2007FEB15_AVDE_RFR_AN_01.pdf

inquisitor said:
Actually the CPU (Qualcomm MSM7201a) is capable of supporting five different UMTS frequency bands, however only three at once. Those bands again are indeed preset by the built-in RF chips, so there is no chance of changing frequencies.
Here's the datasheet of the MSM7200 (identical to the MSM7201a in terms of RF support) with an overview of possible RF chip configurations at the bottom of page 3: http://www.ent.eet-china.com/PDF/2007FEB/DTCOL_2007FEB15_AVDE_RFR_AN_01.pdf
Click to expand...
Click to collapse
Whether a specific band is supported or not in a particular RF topology also depends on the type of RF amplifiers coupled with the baseband IC. Traditionally HTC has been using universal amplifiers for 2G/2.5G hence all recent phones support GSM/GPRS/EDGE on any frequencies. Due to Qualcomm vs. Broadcomm patent lawsuits, they had to stop using universal amplifiers for 3G around 2006, hence most modern phones only support WCDMA/UMTS frequencies that they have individual amplifiers for.
I think it's not HTC specific, any vendors using Qualcomm MSM basebands are doing this as well. So the bottomline is - in most cases it's a hardware issue. In some rare cases (when universal or multi-frequency WCDMA amplifier is installed) frequencies are disabled in software. I can't recall any HTC device that would have this kind of software only limitation.

Wow Very informational posts
Thanks Guys!!!
Hey I'm an old (ancient pre-Intel <BG>) micro hacker
but fairly new to phones. I'm currently very happy with
my cooked AT&T Pure/TopAz with the Tess Leo 1 Rom
I've had most every model of HP IpAQ upto the 4700s
So the PPC side is pretty comfortable for me.
I'm an old programmer with EE background
But really ready to try and get my teeth into the radio side
of phones just trying to understand enough to make some
resonable qualitative and quantitative benchmarks on some these radios
Maybe more to the point is understand if so and so's great looking nice
new task bar should and is properly displaying "3G" or "H" or ?)
But its been hard sorting the Euro vs US and GSM vs CMRS
Phone info.
Can anyone suggest a good "newbie guide" ? or any source of info
(I kinda hate the term "for dummies" but.... )
to the radio end, signal strength, band, networks etc ?
Sorry if this has been asked a million times or its only "two posts" away
but the amount of info here is great! but the s/n is NOT so great <BG>
Thanks Alot
Kenn Lynch
Hey is there a spell checker in this xda forum?
my apologies
I love my phone

if you are on a pc most internet browsers these days got their own spellchecker

Spell check thanks
You know its amazing what some people consider "most" Web Browsers
I was thinking "largest" web browser (Internet Explorer 8.XX on XP)
Spell checking is not natively included, so all my checking has been with
local docs or remotely using the web pages own checker for web based mail and forums.
So I started thinking no wonder this guys name starts with "Rude"
But I looked around and there is a free plug-in for IE called ieSpell.
I seldom bother with the other browsers so I can't say if
spell checking is included right "out of the box" in them either.
but I just installed ieSpell here and it hyphenated "plug-in" nice and easy
Thanks
when you are right you are right
Guess you can teach and old dog <BG>
KJL

AT&T Secures License To Operate In Indonesia

NEW YORK (Dow Jones)--U.S. telecom operator AT&T Inc. (T) said Wednesday it has secured a license to operate in Indonesia, providing the telecommunications giant with a new catalyst to grow its enterprise business in Asia.
AT&T is the first foreign telecom operator to be granted a license in Indonesia. Previously, the company had to sell its service in partnership with local providers. A license allows AT&T to provide service directly to companies in the country, which can provide a boost to revenue and margins because the company doesn't have to share the pie.
Click to expand...
Click to collapse
Source:
http://online.wsj.com/article/BT-CO-20110607-715059.html
http://www.adweek.com/news/technology/att-wins-operating-license-indonesia-132339
NNNNNNUUUUUU!!!!!!!

Lets Beat Verizon's Encryption. Mass Effort Required.

TL;DR - Verizon blocks your ability to unencrypt the boot loader and upload another wireless carriers software for use on their network which is explicitly written into the law. While Verizon stated the encrypted boot loader helps keep customer support high and FCC deemed it reasonable, Verizon will have a hard time explaining the reasonableness of it's encryption when you've decided you would like to take your device to another network. This "locking" of the device to Verizons network only is the noose we're going to tie around Verizons neck.
The concept:
Say you've decided you may be interested in taking your 4g device to another network. Unfortunately, the bootloader is encrypted and any flash of another providers software renders the device "bricked."
The law, as it is written (Feel free to skip to the next section):
§ 27.16 Network access requirements for Block C in the 746–757 and 776–787 MHz bands.​
(a) Applicability. This section shall apply only to the authorizations for Block C in the 746–757 and 776–787 MHz bands assigned and only if the results of the first auction in which licenses for such authorizations are offered satisfied the applicable reserve price.​
(b) Use of devices and applications. Licensees offering service on spectrum subject to this section shall not deny, limit, or restrict the ability of their customers to use the devices and applications of their choice on the licensee’s C Block network, except:​
(1) Insofar as such use would not be compliant with published technical standards reasonably necessary for the management or protection of the licensee’s network, or​
(2) As required to comply with statute or applicable government regulation.​
(c) Technical standards. For purposes of paragraph (b)(1) of this section:​
(1) Standards shall include technical requirements reasonably necessary for third parties to access a licensee’s network via devices or applications without causing objectionable interference to other spectrum users or jeopardizing network security. The potential for excessive bandwidth demand alone shall not constitute grounds for denying, limiting or restricting access to the network.​
(2) To the extent a licensee relies on standards established by an independent standards-setting body which is open to participation by representatives of service providers, equipment VerDate Mar<15>2010 16:46 Dec 15, 2010 Jkt 220201 PO 00000 Frm 00334 Fmt 8010 Sfmt 8010 Q:\47\47V2 ofr150 PsN: PC150325 Federal Communications Commission § 27.20 manufacturers, application developers, consumer organizations, and other interested parties, the standards will carry a presumption of reasonableness.​
(3) A licensee shall publish its technical standards, which shall be nonproprietary, no later than the time at which it makes such standards available to any preferred vendors, so that the standards are readily available to customers, equipment manufacturers, application developers, and other parties interested in using or developing products for use on a licensee’s networks.​
(d) Access requests.​
(1) Licensees shall establish and publish clear and reasonable procedures for parties to seek approval to use devices or applications on the licensees’ networks. A licensee must also provide to potential customers notice of the customers’ rights to request the attachment of a device or application to the licensee’s network, and notice of the licensee’s process for customers to make such requests, including the relevant network criteria.​
(2) If a licensee determines that a request for access would violate its technical standards or regulatory requirements, the licensee shall expeditiously provide a written response to the requester specifying the basis for denying access and providing an opportunity for the requester to modify its request to satisfy the licensee’s concerns.​
(e) Handset locking prohibited. No licensee may disable features on handsets it provides to customers, to the extent such features are compliant with the licensee’s standards pursuant to paragraph (b) of this section, nor configure handsets it provides to prohibit use of such handsets on other providers’ networks.​
(f) Burden of proof. Once a complainant sets forth a prima facie case that the C Block licensee has refused to attach a device or application in violation of the requirements adopted in this section, the licensee shall have the burden of proof to demonstrate that it has adopted reasonable network standards and reasonably applied those standards in the complainant’s case. Where the licensee bases its network restrictions on industry-wide consensus standards, such restrictions would be presumed reasonable.​
How to play it:
Call Verizon Tech Support. Ask for the encryption and verification software used to verify the Operating System is approved "by Verizon" so you could potentially take your device to another network. You may be told, as I was by a Tech Support Supervisor, that it's as simple as having your new carrier flash their software onto the phone and it's good to go. Of course, we know this bricks the device. When you are told no, you could then ask to be transferred to someone who can remove this software, or, you could end it there, your job is done.
Once you're told "No." you have a legitimate complaint to file with the FCC. The law states specifically "No licensee may disable features on handsets it provides to customers, to the extent such features are compliant with the licensee’s standards pursuant to paragraph (b) of this section, nor configure handsets it provides to prohibit use of such handsets on other providers’ networks. The last part, in bold, is the noose you've just tied around Verizon's neck.
This will only work *if* you are told "No" by a Verizon Representative. As every call is logged by Verizon, you cannot lie about having been told no as their logged call may be used against them. You may ask them to note this in your account as well.
What to tell FCC:
You're allowed 1000 characters when you fill out the FCC complaint form. Lets do it with 690 characters:
I was told by a Verizon Wireless Representative that Verizon would not allow me to remove the software installed that verifies the device only runs "Verizon approved" software, and the encryption protecting it. As this explicitly limits my ability for a new carrier to provide their software on my device, for use on their network, I feel it is a direct violation of FCC code § 27.16(e). Any Operating System uploaded to my device not "Approved by Verizon" renders the device non-functional and requires the device be sent back to the manufacturer or Verizon for reapplication of "Verizon Approved Software" effectively restricting my ability to use my device on the network of my choice. Thank you.
Click to expand...
Click to collapse
How to tell the FCC:
https://esupport.fcc.gov/ccmsforms/form2000.action?form_type=2000F
With enough pressure, provided the FCC will enforce their own codes, we can effectively unlock *all* devices with 4g capability. Samsung, Motorola, Etc,.
(Mods, please feel free, as you see fit, to merge my other thread that is far less refined and was used as a brain storming session for the creation of this one. Thank you)

Wasn't there something about all the above is null if the company needs to lock it down to provide better service?
Sent from my SCH-I535 using Tapatalk 2

There was something that if they say it is for network security that is the loop hole they can use. But they have double standards of having some phones with unlocked bootloader not to mention allowing the developer edition which is the same exact phone just not locked down.
Sent from my SCH-I535 using xda app-developers app

Forgetfull said:
Wasn't there something about all the above is null if the company needs to lock it down to provide better service?
Sent from my SCH-I535 using Tapatalk 2
Click to expand...
Click to collapse
I think you're referring to the unlock request made by a Droid Razr user, which what you wrote was essentially Verizon's official response.
We're taking a different approach here, which asks the bootloader be unlocked, not just because, but for the ability to load a different carriers software on the device to switch said phone to a different carrier. A request, which has nothing to do with providing any service to the user, at all. This is the beauty in it.

SAR of the nexus 6p

I got the following values from phonearena
are these legit? Because these seems very high ... almost close to the limit.
Head 1.49 W/kg
Body 0.81 W/kg
Product Specific Use 1.44 W/kg
Simultaneous Transmission 1.56 W/kg
USA figures

On an Indian website I see its mentioned as 1.18 W/kg

Sorry for the figures i posed they are north american . limit being 1.60

the phone should have the same SAR test regardless if its in India or North America. so which one is the real test result? there needs to be an accurate test done.

slickromeo said:
the phone should have the same SAR test regardless if its in India or North America. so which one is the real test result? there needs to be an accurate test done.
Click to expand...
Click to collapse
i found this on wiki, so i think you're right. now we just need some independent lab results:
https://en.wikipedia.org/wiki/Specific_absorption_rate#Mobile_phone_SAR_testing said:
United States: the FCC requires that phones sold have a SAR level at or below 1.6 watts per kilogram (W/kg) taken over the volume containing a mass of 1 gram of tissue that is absorbing the most signal.
European Union: CENELEC specify SAR limits within the EU, following IEC standards. For mobile phones, and other such hand-held devices, the SAR limit is 2 W/kg averaged over the 10 g of tissue absorbing the most signal (IEC 62209-1).
India: switched from the EU limits to the US limits for mobile handsets in 2012. Unlike the US, India will not rely solely on SAR measurements provided by manufacturers; random compliance tests are done by a government-run Telecommunication Engineering Center (TEC) SAR Laboratory on handsets and 10% of towers. All handsets must have a hands free mode.
Click to expand...
Click to collapse

Regardless. The values are pretty high!
Regards
Pratik

Test results in the United States, should match the test results in india or anywhere else in the world, it is after-all... the same exact phone the testing is being done on. the results should match no matter where you bring the phone to. If any of you have any other test results performed independently, please do share !

let me ask this - if these numbers are solid, is it going to prevent you from buying the phone?

640k said:
let me ask this - if these numbers are solid, is it going to prevent you from buying the phone?
Click to expand...
Click to collapse
For me, and a few others I know Yes it will prevent them from buying the phone.
I had blackberry phones with high sar rates like the ones listed in the first post, and when talking on the phone .. it would heat up vs my note 3 .
So yes some people actually do look at SAR before purchasing

Checked the FCC for the tests done on the Nexus 6p. See the reports for "exposure" if you're interested. It does list various values for radiation.
FCC Link

Hi, can anyone look into manual and tell me what is the SAR value of Nexus 6P (European version), please ?
I can´t find it on the internet.
Thank you very much!

1.17 & 0.54.

New LTE-A update on G935F ?

I'm on a G935F and on T-Mobile. I wanted the F because I wanted the Exynos processor and read up that the bands / frequencies were near identical, especially with T-Mobile's shutting down of it's AWS for +HSPA
http://www.fiercewireless.com/wirel...spa-service-its-aws-spectrum-market-by-market
Then I saw this
http://forum.xda-developers.com/tmobile-s7-edge/how-to/lte-update-t3456612
https://newsroom.t-mobile.com/news-and-blogs/lte-advanced.htm
"Today, I’m proud to announce that we’re first (again) to introduce new technology that delivers a massive 2x speed boost to customers. 4x4 MIMO (multiple input, multiple output) doubles the number of data paths between a cell site and your phone. Double the paths = up to double the speed than before!"
"But, we’re not stopping there. Today, we’re also first to launch another new technology – 256 QAM (quadrature amplitude modulation) for downloads and 64 QAM for uploads. These new technologies increase the number of bits delivered per transmission for even faster speeds. In fact, combined with 4x4 MIMO, 256 QAM delivers download speeds up to a blazing fast 400 Mbps."
Will the G935F get these benefits if I have a T-Mobile SIM? FrequencyCheck.com makes me think I might, but not sure if it's software based and would need new firmware:
https://www.frequencycheck.com/models/Ak5yr/samsung-sm-g935f-galaxy-s7-edge-lte-a-samsung-hero-2
Can someone more knowledgeable weigh in on this?
Thanks,
diznanl
*EDIT*
I'm seeing this:
https://newsroom.t-mobile.com/news-...ater-seattle-area-with-extended-range-lte.htm
Looks like, again, based on the FrequencyCheck.com site, we should be good to go ... but are there software updates that need to happen? Still curious...

bump...?

As far as I know only Snapdragon x12, x16 & x20 modems supports LTE mimo 4x4, and even though Mobile device needs to has 4 antennas and mimo has to be enable by software. Exynos do not support 4x4 mimo at the moment.