Develop Bugs

GSM Radio -Quad Band or Alter Tri-Band

Can anyone tell me if it is possible to change the HTC from a Euro phone to a North American phone by perhaps changing a chip or programming to support 850/1900 here in North America? I live in an area where 1900 is a bit spotty and I lose signal, especially inside buildings. I love my Uni, but I have too many people complaining that I'm not getting their calls and I don't get signal where other's do.
I'm afraid I don't have enough hardware experience to be qualified to even venture a guess. But shouldn't it be as easy as changing a chip or a crystal or something?

It's just a matter of both the range of the tower you're near, as well as possibly your PRL. The priority roaming list tells the phone who's service you're allowed to use. So if there's a tower within range, but not in the PRL, chances are your phone won't use it OR it will show up as roaming.
I know you can affect the 3G part of Android phones by changing the modem firmware when using Odin, and even them I'm not sure what change is made if truly any. I don't have 3g yet with my provider, which uses the 850/1900 as well, but I currently have a Euro firmware on my phone using XW Euro firmware. I'm not sure how it will affect my 3g until my provider enables it.
Other than that, I think it's a limitation of the radio chip in the phone. It may be a firmware/software setting, or it could be hard coded into the chip.. again I'm not sure

Have you seen the previous post date? lol.
Anyway thanks for your reply

Lol, true it's old, but if anyone has a solution I'd accept it. However, I've since moved on with 3 different phones including the PPC6800, the Omnia II and presently on the iPhone 4.
Thanks anyway,
TS

No it is not possible, it´s a hardware related stuff.

Timeshell said:
Lol, true it's old, but if anyone has a solution I'd accept it. However, I've since moved on with 3 different phones including the PPC6800, the Omnia II and presently on the iPhone 4.
Thanks anyway,
TS
Click to expand...
Click to collapse
you have to change the part which contains the Radio hardware

[Q] Windows Mobile ROM on 3rd party carrier.

I have a HTC Touch Pro2 on Bluegrass Cellular. It is a small Cellphone company unlike your Sprint, ATT, and Verizon. A lot of their devices are from the same pool as US Cellular. They do not use SIM cards as they say the network info is "Built into the device". Now I don't know if that means in the actual firmware or if it is a small data file on the device. They are a CDMA network.
So with that said, it brings me to my question: can I flash a different ROM on this device and it work?
A simple yes, no, or I wouldn't try it will do.
I know that I can simply make a back up of my current one and re-flash it if it didn't work, but due to the risk of flashing I don't want to do it more than I have to.

Yes, you should be able to flash a different ROM no problem. Just make sure you use all the tools for a CDMA device, not GSM. There's GSM only variants of the TP2 - although the CDMA version also has a SIM slot and can be used for GSM, it's still a CDMA phone .

Thanks a bunch for the response.
That brings me to my next question... Bluegrass tells me that they can not use a phone that is not purchased from them. Is this true?
I feel like it would be a simple setting change, or something of that nature, for their network to pick it up, and they just wont do it.
As I LOVE their coverage area, but sometimes their selection of phones is lackluster.

JefferyD(0 said:
Thanks a bunch for the response.
That brings me to my next question... Bluegrass tells me that they can not use a phone that is not purchased from them. Is this true?
I feel like it would be a simple setting change, or something of that nature, for their network to pick it up, and they just wont do it.
As I LOVE their coverage area, but sometimes their selection of phones is lackluster.
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Odd are that they can, but choose not to. Most carriers are that way. The only time you will see a hardware issue is trying to use a CDMA device on a GMS network.
You could try calling back until you find a rep in the mood and/or had the knowledge to help you.

wizardknight said:
Odd are that they can, but choose not to. Most carriers are that way. The only time you will see a hardware issue is trying to use a CDMA device on a GMS network.
You could try calling back until you find a rep in the mood and/or had the knowledge to help you.
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The problem is you'll need to flash it to their network... and quite often the 3rd party shops will do it for a fee.
You can do it yourself as well, but it involves mucking with QPST and the phone's programming.
Also, my previous post assumed the phone already worked on that carrier... Whoops.

arrrghhh said:
The problem is you'll need to flash it to their network... and quite often the 3rd party shops will do it for a fee.
You can do it yourself as well, but it involves mucking with QPST and the phone's programming.
Also, my previous post assumed the phone already worked on that carrier... Whoops.
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The Touch Pro2 does work. I'm considering getting a new WP8 when it comes out, and I practically know my carrier wont have it for at least a few months. And I don't like to wait

Unlocked Sprint S6 on Verizon?

I have an unlocked Sprint Samsung S6 and I'm trying to get it to work on Verizon but it doesn't want to work. It shows an exclamation and R where the signal bars are. I have tried setting up the APN and a Verizon rep put the sprint phone in their system, but that didn't work either. Is there any way to get this to work? Do u have to flash Verizon's Rom to it? I noticed that even unlocked it still seems to have the sprint activation stuff..... Please help, scoured the Internet and forums to no avail :/

If you actually got the phone activated onto your line on Verizon, you will need the Verizon PRL on the device for it to show it connected natively to its towers (the 'R' is a roaming indicator...your device is seeing the Verizon towers as roaming since it loaded with a tower list with Sprint towers prioritized). Verizon is still CDMA, so you will need the proper PRL flashed to the phone for it to work, first & foremost, along with your NAM information and all of the Verizon data settings flashed in place of the Sprint data settings. With regard to CDMA switching from Sprint/Sprint-based to Verizon/Verizon-based, there is more to it than merely an ESN swap (activation by an agent) & inserting a SIM.
I am not here to hold your hand through the flashing of anything, but I'm letting you know what will need to be done. These phones have different model numbers for a reason (unlike "hybrids" like newer Nexus devices, newer iPhones & the recently released Moto X Pure). These different models are designated per carrier and the bundled carrier software for many CDMA devices is used in its OTA programming. Sprint devices typically are packed with MSL/SPCs unique to the device and needed to edit the internal NAM & data settings while Verizon branded counterparts have 0s instead of uniques codes. If this is all over your head, you may need to seek the assistance of someone or a company familiar with flashing to get you going if you are hellbent on using THAT device. Good luck.

worked for me but not stable
I also have the s note 5 from sprint and been trying to make it work on verizon. After so many tries in the mobile network setting i got it to partially work. it still have the R symbols on top, which shows your roaming but you will get a 3g speed. My current setting is
Settings>Mobile Networks>Network mode >automatic
Settings>Mobile Networks>data roaming>Roaming network>automatic
Settings>Mobile Networks>data roaming>Roaming guard> all off
Settings>Mobile Networks>data roaming>everything else on
you also have to use the verizon app settings.
i've also tried flashing the prl but had no luck. Any suggestion on how will be appreciated.

So, how about an idiot's guide for making this happen?
If I need help from a vendor, how about posting some referrals, what needs to be done, and how much is fair to pay?
I am a self-professed newb and I just want to take the Sprint S6 that I own outright to Verizon.
Especially because I paid full price for the S6, and Sprint's service sucks inside my building.
Thanks .

What VicFreeze said above is 100% correct, you would have to reprogram/flash the phones CDMA chip/radio and even Verizon will not be able to do so (legally or maybe not smart enough to know how), you want to be on Verizon you need to get one of their phones. Your phone is a G920P, the P is specific to Sprint and the phone has been flashed internally to know the MIED, MDM/MIN, PRL and login passwords for their networks along with the MSL Code direct from the Samsung factory just for Sprint.
So Yeah you can change all this by reprogramming the CDMA chip inside the phone, first you need professional software that will cost $$$ hundreds of dollars, software like CDMA workshop, QPST or DFS will work, learning to use this software is not for newbies, you will also need to get the information from Verizon to flash their carrier specific codes and numbers into the phone, it's not like swapping out your SIM Card like a GSM Phone and your on a different network, this is CDMA and its why Sprint/Verizon use this, its to lock you down. (no, that's not why)(LOL)
Just Google "Carrier programming on CDMA phones"..
I think it would be cheaper to sell your Sprint phone and just get a Verizon phone and save yourself a lot of hassle. Get a G920V, its already flashed with Verizon Codes to access their LTE Network from the Samsung factory (Hence the V is specific for Verizon). Verizon's sales staff might not even know what a CDMA phone is so would you really want them to reprogram it??

dagreek05 said:
I have an unlocked Sprint Samsung S6 and I'm trying to get it to work on Verizon but it doesn't want to work. It shows an exclamation and R where the signal bars are. Is there any way to get this to work? Do u have to flash Verizon's Rom to it? I noticed that even unlocked it still seems to have the sprint activation stuff..... Please help, scoured the Internet and forums to no avail :/
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VicFreeze and MindTricks sound dead on in there advice. One thing I am pretty sure about unless someone corrects me is .... even though Sprint and Verizon are both CDMA, they operate on different frequency bands which is probably why your getting the 'R' for roaming. CDMA Workshop has the ability to change the radio frequency. I think the two companies also encrypt or code their voice and data traffic and you need the software flashed that has their specific decoders or encryption software for the device to work on their system. I am not sure if the specific radio software changes any of this or not. I am not even sure is CDMA Workshop is compatible with newer Samsung phones now as two years ago I programmed my Sprint HTC EVO 4g to work on my Virgin Mobile talk and text plan without much trouble but have not been able to get CDMA Workshop to connect to a Galaxy Grand Prime as of late. What I did two years ago was easier since Virgin runs off of Sprint Service Towers. Having a ROM compiled for Verizon may help but things have changed. What I did with the EVO two years ago ..... the ROM had Sprint radio files compiled with it. I am not sure if some of those files are separated in the system now on more modern devices as ..... back two years ago Sprint was EVDO and not their LTE uses a SIM card to work. So, things have changed and keep changing and evolving. One thing is sure, is almost every year Service Providers along with device manufacturers are changing what they do and how they do it.
tt c6 said:
So, how about an idiot's guide for making this happen?
I just want to take the Sprint S6 that I own outright to Verizon.
Especially because I paid full price for the S6, and Sprint's service sucks inside my building.
Thanks .
Click to expand...
Click to collapse
That's what everyone would love to do but at times proves more hassle than what it is worth. this is why there are sites like Swappa and eBay where you can sell your phone for close to competitive price and pick one up a device that is a comparable condition for the service provider you want to swich to for about a break even price or not much more out of pocket.

I dunno if this thread is dead but process should go something like this.... flash factory binary firmware checking "auto-reboot, nand erase, and F.reset" options. Once it boots enable developer options and oem unlock and usb debugging (then do a factory reset from settings menu). Then you can flash the CSC from Verizon stock. Placing VZW .pit file in appropriate section. Then you can flash the BL,AP,CP files from VZW rom. Personally....this seems like alot of unnecessary work with a great chance for missing something. Might be better to root sprint device and manually install vzw modem files, apns.conf, prl, telephony.db.....better yet why not just flash a custom rom from twrp. thats just one zip file in twrp.

I don't know what I've done differently, but I currently have and use without any problems a Sprint G920P on the nations most reliable network… Verizon. I can tell you that I didn't have to jump through all or any of the hoops that others in this post have outlined. I will tell you what I did ; Flashed G920p with Bigdaddy PL3 Aroma V1.x ,TWRP-3.2.1.0, SuperSu-v2.82, and 3.10.61_Stock_Modified_Kernel_By_Aurora_Rom [email protected]#1. Phone has been unlocked by Idonne apps. I believe that last bit has a lot to do with my success. there is a setting in his app if the phone is to be used on a CDMA network or a GSM network. And not to discredit the person that discouraged you from having a Verizon employee help you but it was he that figured out how to make Verizons system find my phone. Not sure exactly what he did but I saw him take his company phone out of his pocket and scan the sticker on the back of it into the system saying "we will just make the system recognize it". Voila, worked perfectly and continues to operate without flaw on their network. I do get a roam "R", but checking settings indicates that I am not roaming. I live on the border to Canada so it is to be expected, but not the case. As far as Network, device says Preferred Network instead of Verizon. It could say your name for all I care as long as it works! Hope this sheds some light on it for you without having to make all of those unnecessary changes. One last note.... the salesman did say that mine is the first Sprint Device that he has seen on their network.... I guess that makes me special huh? Lol...

Unlocking bands

Hello!
New user here and well, I was wondering if there's any chance that we'll be able to unlock phone bands in this device!
I also know it's probably still unclear as the phone is still new but another user said in another topic that there might be something considering OPO had some tools to unlock bands! So if anyone knows anything about this issue it'd be great!
I'd love to have B28 available on the OP3!
Thanks!

I'd say the reason of the limited LTE band selection is no other than to reduce costs in the hardware. Every band requires it's own amplifiers so making the devices regional it's an easy way to cut corners and not affecting people much (if they don't travel)

bartolo5 said:
I'd say the reason of the limited LTE band selection is no other than to reduce costs in the hardware. Every band requires it's own amplifiers so making the devices regional it's an easy way to cut corners and not affecting people much (if they don't travel)
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I can understand the reason, but it still seems meh to me.
But who knows, maybe there will be a workaround!

hey, ive been looking at buying an OP3 but did read that band 28 is missing which is used for faster and longer range 4G in australia and also common in the rest of asia & some of europe
weird, in this teardown it says the radio can do band 28 ? maybe its just disabled/unsupported?
http://www.slashgear.com/oneplus-3-teardown-part-ii-whats-inside-28446199/

Service disabled sprint

I bought an g7 on ebay to use on tello a sprint mvno and upon putting in a sprint SIM card I got from sprint for this phone I get service disabled and no bars. I got another sprint sim and Same thing. I tried my wife’s iphone5 verizion SIM card in it and immediately had bars and functioning data but no calls or text. I’ve called sprint and tello and they both say it’s on my end and I believe them. Do I need to flash the modem? Can I do anything or should I return it or will the next one have same problems? Any help greatly appreciated

Does the phone you bought support the correct bands?
What is shown on the box the phone came in?
Ii'm aware that some advertised as "GSM only, no CDMA" but write what is shown directly on the box.
Write that in a reply here but also call sprint DIRECTLY and ask to speak to a HIGH LEVEL tech--not the basic clown monkey, but someone who actually knows what they are talking about.
Give them the bands and modes shown on the white sticker on the box and see if they can make it work.
If you want to change bands, dial *#546368#*710#
Then go to field test and engineering mode and you can change the LTE bands there. Find out which bands are supported.
You can also change the GSM modes but they had better be on the phone to tell you what to set.
After changing any bands, go to network mode and set it to automatic, or phone calls will not connect at all.

Falkentyne said:
Does the phone you bought support the correct bands?
What is shown on the box the phone came in?
Ii'm aware that some advertised as "GSM only, no CDMA" but write what is shown directly on the box.
Write that in a reply here but also call sprint DIRECTLY and ask to speak to a HIGH LEVEL tech--not the basic clown monkey, but someone who actually knows what they are talking about.
Give them the bands and modes shown on the white sticker on the box and see if they can make it work.
If you want to change bands, dial *#546368#*710#
Then go to field test and engineering mode and you can change the LTE bands there. Find out which bands are supported.
You can also change the GSM modes but they had better be on the phone to tell you what to set.
After changing any bands, go to network mode and set it to automatic, or phone calls will not connect at all.
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Thanks for the reply. So I’m learning more about the phone as I go, there was no phone box, it just came in a simple brown shipping box. So on the phone itself there’s a sticker that says the meid as being a sprint version of the phone but when you check the settings it’s a different unlocked version. So I’m thinking some one rooted/unlocked a sprint version and resold it. Which okay, so now does that mean I can’t get updates? I’ve never rooted a phone so this is new to me. If i switch carriers and get the network working will I still not have the updates I want?

X3am said:
Thanks for the reply. So I’m learning more about the phone as I go, there was no phone box, it just came in a simple brown shipping box. So on the phone itself there’s a sticker that says the meid as being a sprint version of the phone but when you check the settings it’s a different unlocked version. So I’m thinking some one rooted/unlocked a sprint version and resold it. Which okay, so now does that mean I can’t get updates? I’ve never rooted a phone so this is new to me. If i switch carriers and get the network working will I still not have the updates I want?
Click to expand...
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Sorry I cannot help with this as I have no knowledge of these things.
My phone was an official retail box that had the "made in korea" sticker on it, the model number, three barcodes (dual sim) and all of the bands supported.
If yours didnt have this, you probably should just return the phone.
Always make sure you buy NEW, boxed phones and not third party.