Develop Bugs

[Q] 3G not working on AT&T US on DHD bought in Singapore

Hello Guys,
I am new to this forum and need some help with my DHD which I bought in Singapore.
I am using it in US with AT&T and unfortunately I am not getting 3G eventhough i have 3G service. I am getting EDGE after setting up the APN. Please let me know if there is a way to get this phone working on 3G. I have already called HTC and AT&T and they mentioned that there might be difference in the frequencies.
Thanks

DHD UMTS (3g) is 900/2100 MHz, check what your carrier provides.
My particular carrier in Thailand, TRUE, only broadcasts 850 UMTS, others here use 900/1900/2100.
Sent from my Desire HD using XDA App

[Q] G2 3g on AT&T?

If i unlock my G2 using gfree or anyother method will i still have my 3G when i switch it to AT&T from T-Mobile? does anyone know of any problems with signal and what not when it gets unlocked? thanks.

Army_Spec_Ops said:
If i unlock my G2 using gfree or anyother method will i still have my 3G when i switch it to AT&T from T-Mobile? does anyone know of any problems with signal and what not when it gets unlocked? thanks.
Click to expand...
Click to collapse
You will only be to access 2G/edge data speeds, no 3G connectivity since AT&T uses different 3G bands.. assuming you are currently using a T-Mobile G2 with the carrier T-Mobile... :?
You won't have any signal issues unless AT&T has horrible coverage where you live.

you will not change anything hardware related... you just unlock/root your phone which allows you to modify hardware and software related things. But if you don't touch the antenna software then nothing will change
@CaliBoyPhillip; when I was in the states my phone switched from AT&T and T-Mobile all the time (roaming) and still had 3g reception, the phone supports most frequencies.

no im currently using a Aria with AT&T but im getting the G2 or the G2X tomorrow. and ok so i wont lose my 3G?

Army_Spec_Ops said:
no im currently using a Aria with AT&T but im getting the G2 or the G2X tomorrow. and ok so i wont lose my 3G?
Click to expand...
Click to collapse
G2x will work with At&ts 3g/4g. As for G2 I was told it doesn't support the 3g/4g from at&t. Remember the buy out isn't final yet.
Sent from my HTC Desire Z/G2 using XDA Premium App

SnowOokami said:
you will not change anything hardware related... you just unlock/root your phone which allows you to modify hardware and software related things. But if you don't touch the antenna software then nothing will change
@CaliBoyPhillip; when I was in the states my phone switched from AT&T and T-Mobile all the time (roaming) and still had 3g reception, the phone supports most frequencies.
Click to expand...
Click to collapse
hmmm Interesting... it was prob due to the reason that you were roaming but if he uses an AT&T SIM on his SIM unlocked G2 from T-Mobile, he won't have 3G access I think... The G2 runs on 850/900/1800/1900 for edge and 1700/2100 radio for 3G data, meanwhile AT&T operates on 850/1900 for EDGE and 850/1900 for 3G.... not compatible !
EDIT: source for the bands ATT uses for 3G gotten from here.. http://www.att.com/gen/press-room?pid=14003

CaliBoyPhillip said:
hmmm Interesting... it was prob due to the reason that you were roaming but if he uses an AT&T SIM on his SIM unlocked G2 from T-Mobile, he won't have 3G access I think... The G2 runs on 850/900/1800/1900 for edge and 1700/2100 radio for 3G data, meanwhile AT&T operates on 850/1900 for EDGE and 850/1900 for 3G.... not compatible !
EDIT: source for the bands ATT uses for 3G gotten from here.. http://www.att.com/gen/press-room?pid=14003
Click to expand...
Click to collapse
THis is correct. The G2 WILL NOT work with ATT 3G. If you want 3G you need to purchase the NAM (North American Model) of the Desire Z. It is sold in Canada on the Bell Network. You can find it online unlocked and unbranded and it WILL work on ATT no problem. It is going to cost you though, 450-550 depending where you get it.

Same reason iphone won't connect to tmobile 3g...amazing people still don't understand this
Sent from my Vision using XDA Premium App

ok so stupid question but im gonna ask it anyways lol is there anything that i can do to make it work with 3G if i dont want to buy the desire z?

Not unless you know how and which chipset to replace on the board. Ie not possible.
Sent from my HTC Vision using XDA App

Army_Spec_Ops said:
ok so stupid question but im gonna ask it anyways lol is there anything that i can do to make it work with 3G if i dont want to buy the desire z?
Click to expand...
Click to collapse
Nope, the phone's hardware is what decides what bands it can use.
Sent from my T-Mobile G2

Get a desire Z from rodgers Canada the 3g bands are the same

To bad radio isn't software
It's to bad that phones don't have the radio frequencies programmable in software (much like an fm radio). Is that even possible?

[Q] Changing GSM Band Lock

Hi Guys,
Well, this is my first time posting here, so hello to you all!
Anyway, down to my problem. I have a Desire Z A7272 running on the Australian Telstra network. I just bought a new sim card today that is Next G activated.
I have a few problems which I am hoping to solve by asking you experts First of all note that the Telstra Next G network runs on the 850mHz bandwidth, which I believe my phone does not support. Seeming as I live in regional Australia, this is undesiarable because although 21000mHz is supported and available, Telstra only runs it in the metro area, where it doesn't reach me.
I was searching the net for a couple of days until I found a forum where it explained how to lock the GSM bands. I can't link it as I have lost the page. What I did was dial *#*#4643#*#* and change the network lock to "United States". This was because in the US they don't have the 900mHz band they use the 850mHz band and I was hoping to get my phone to use the 850mHz band.
Now to my 2 problems.
1. When I locked the phone to the 850mHz band, it seems that I can't access *#*#4643#*#* anymore. I type the number in, and nothing opens. I was wondering how to fix this so I could set it up to "Automatic" again.
2. I was wondering if there is anyway hardware or software wise to be able to access and use the 850mHz network. If you could link or quote some reliable/trusted sources that would be excellent. I will take unknown sources but will do with caution, I don't want to break my 2 week old phone.
Thanks guys, sorry for the essay.
Haash.
EDIT: Please note that my phone is running Android 2.3.3 with HTC Sense 2.1.

Your phone is only capable of accessing whatever bands your hardware is designed to. I don't know the specs for your Desire Z, but if the bands you want are not listed in the hardware specs, you will NEVER get them. You would need to investigate whether there is a desire z model built to run on the gsm spectrum you need.
For example, here in the US, Tmobile and AT&T phones can be unlocked to use on each other's EDGE network. But no magic code can ever give them the hardware needed to run each other's 3G network.
Sent from my T-mobile G2 using Tapatalk

Nospin said:
Your phone is only capable of accessing whatever bands your hardware is designed to. I don't know the specs for your Desire Z, but if the bands you want are not listed in the hardware specs, you will NEVER get them. You would need to investigate whether there is a desire z model built to run on the gsm spectrum you need.
For example, here in the US, Tmobile and AT&T phones can be unlocked to use on each other's EDGE network. But no magic code can ever give them the hardware needed to run each other's 3G network.
Sent from my T-mobile G2 using Tapatalk
Click to expand...
Click to collapse
Thanks, now all I need to do is get my *#*#4643#*#* working again so I can change it back to the 21000mHz network that I can use.

For anyone wondering:
Europe:
HSPA/WCDMA: 900/2100 MHz
GSM: 850/900/1800/1900 MHz
Asia Pacific:
HSPA/WCDMA: 900/2100 MHz
GSM: 850/900/1800/1900 MHz
BUT, for the Tmobile G2 (American version)
GSM:
850, 900, 1800, 1900
UMTS:
1700/2100, 2100

Thanks, does anyone know how to unlock *#*#4643#*#*?
Sent from my HTC Desire Z

It could possibly be that the code you're using isn't correct. I believe it is *#*#4636#*#*
Sent from my HTC Vision using XDA App

hellorufino said:
It could possibly be that the code you're using isn't correct. I believe it is *#*#4636#*#*
Sent from my HTC Vision using XDA App
Click to expand...
Click to collapse
Oh wow thank you so much. I feel like a complete idiot now. Thanks a ton.
Sent from my HTC Desire Z

i wish the new roms can make this possible, i want to force 3g sometimes..

3G on Straight Talk

I have CM7 loaded, but doesn't really matter what rom I load, I can't seem to get 3G data speeds. I am getting internet, so that tells me the APN is setup correctly, just not 3G. Any thoughts?
Jason

probably need to look into a different radio

Any ideas? I tried 3 different ones!
Sent from my HTC Vision using XDA

The model I have is A7272 and I have an AT&T sim. Do you think the sim tells the phone what band to use for 3G? They have the option of a T-mobile sim, does anyone think that will work?

look up the A7272 on gsm arena to see what 3G band it supports and cross reference it with ATT's 3G band
Sent from my Desire Z via XDA App

I think it was because I had an ATT sim. I got a T-mobile sim and now I'm getting "H" everywhere. Still doesn't seem as fast as Verizon's 3G, but for $45/month I can't beat it. So the A7272 supports HSDPA 900 / 2100, is that why with the T-Mobile sim I can get H, because they have a 2100 HSDPA Frequency?

AT&T uses the 850/1900 spectrum for 3g and the 700mhz spectrum for 4g.
Since your phone supports none of those, that's why.
T-Mobile uses 1700/2100 (requiring both) or 1900 for 3g/4g. now, you only have half of the 2 spectrum requirement so you probably only have "half" 3g. Tmobile uses one spectrum for upload and one for download. I don't know which one is which, but if you only have one, that means you'll only get 3g/4g speed on either uploads or downloads, but not both.

I guess I fell into this trap as well... I bought a desire z thinking I could use 3g on it with my ATT/Straight talk sim. After unlocking and re-roming, I now see the same issue, stuck on Egde, and really slow edge at that.
jch2os, did you see a difference in your service area/call quality switching to the tmobile sim? I've been really happy using an Inspire on Straight talk with ATT's network, do you feel the tmobile service is a downgrade from what you previously had with ATT/Straight talk?
Thanks for the info!

After some research via eBay and Amazon, it turns out that there is two versions of the Desire Z. There is the A7272 which supports the WCDMA 900/2100 MHz bands and the A7275 which supports the 3G 850/1900 MHz bands.
idenlover, if your device is getting EDGE on the Straight Talk sim that runs on AT&T's bands, your device is the A7272 and you should get the T-Mobile Straight Talk sim. I myself am a G2 user on T-Mobile and I can say service and calling is pretty much crystal clear except in school, where there are numerous concrete buildings. Then again, I'm based in Miami, FL so I wouldn't know how service would be on your end. I hope this helps!

if you want AT&T you need the A7275 from bell canada.

Hi all! Look like i have the same problem. I have Desire Z from Russia - with russian symbols in a hard-keyboard. And in FIDO network i have only EGDE signal - never 3G. My question: what a part of phone i need change? Antenna? GSM-module? or something other? Please don't advice me change the phone - i need this keyboard, with russian symbols!!! )
P.S. If anybody know solution this problem in software (any radio, ROM, or etc.) - please, answer me too. I don't want a lot open the phone and change any parts, only if this really needed. )
P.P.S. If it important - my h-boot is 0.84.2000.

Thread moved to Q & A section.

Create a separate thread so more people can help
Sent from my HTC Vision using xda app-developers app
---------- Post added at 04:17 AM ---------- Previous post was at 04:14 AM ----------
From what I get from your problem is that your phone doesnt support the FIDO network 3g bands. I think that is hardware locked. Hopefully somebody can chime in
Sent from my HTC Vision using xda app-developers app

help! straight talk edge BS!
idenlover said:
I guess I fell into this trap as well... I bought a desire z thinking I could use 3g on it with my ATT/Straight talk sim. After unlocking and re-roming, I now see the same issue, stuck on Egde, and really slow edge at that.
jch2os, did you see a difference in your service area/call quality switching to the tmobile sim? I've been really happy using an Inspire on Straight talk with ATT's network, do you feel the tmobile service is a downgrade from what you previously had with ATT/Straight talk?
Thanks for the info!
Click to expand...
Click to collapse
add another one to the list. how did you fix your problem, if at all? this stupid edge crap is garbage.

HTC Desire in USA

Hi everybody, I am going to live in the US for a semester and I want an american number. I found the possibility of buying a Sim Card on T-Mobile and use it with my unlocked phone. The problem is that my phone does not appear in the list of compatible phones. My phone is HTC Desire (Bravo), European model. In the box it appears the following: GSM/GPRS/EDGE 850/900/1800/1900 and HDSPA/WCDMA 900/2100.
Will I get 3G? I've talked to several operators, each one tells me a different thing. There was even one who asked for my IMEI and told me 3G would work 100% sure. Others tell me that I won't only get EDGE speed.
Who can clarify this? It is REALLY important. I LOVE my cellphone, I don't want one of those prepaid phones that are crap, I'd only buy another phone if it would be better than mine, but they are really expensive and it has no sense to buy a cellphone for 4 months when I have one cellphone that I love.
WHAT CAN I DO? I will use data on a daily basis to connect with my family overseas!

Most of US carriers use 850 and 1900MHz for GSM and 1700 and 1900 for HSPA and WCDMA, so I think you won't have luck with 3G, but the rest will do perfectly.
Sent from my HTC Desire using XDA