Database Info

3G Frequencies

Is there a way to change the 3G Frequencies on the G1 to support AT&T 3G network?

Nope, thats a hardware issue.

I thought it was possibly a software issue. If not, is there a way to change out the chip or the incompatable part to make it compatible?

card13 said:
I thought it was possibly a software issue. If not, is there a way to change out the chip or the incompatable part to make it compatible?
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Nope...not going to work for many reasons.

been answered plenty plenty of times.

From what I can figure a hardware change may not be required with the correct radio but we dont know the right radio without the right hardware. lol I know that makes no sense but it makes as much sense as anyone can make of it thus far. When its possible I assure you I will be among the first to do it. Although Im not ready to try installing a new radio without first acquiring a backup phone but if I do Im gonna give it a try and maybe have better luck than the last guy to try.

What about a mini-usb attachment that can receive atnt signals?
I am sure with that and the right software manipulation it could work.

sjbayer3 said:
What about a mini-usb attachment that can receive atnt signals?
I am sure with that and the right software manipulation it could work.
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While it sounds great in theory I doubt anyone would put forth the resources for such a limited market.
You would be best off getting android to work on existing AT&T hardware.

in order to do it we would need hardware which would plug in the bottom and software to tell the phone to use the signal from the attachment.
while there wouldnt be millions in the market i guarantee there are hundreds.
if anyone wants to think about it i dont mind making 50 of em and selling for cost. i have some hook ups in the engineering field i work in

ok, my question is... Europe 3g is diff than tmob usa 3g, but is tmob europe the same 3g setup as US? and if europe 3g is same as tmob europe 3g, is att US 3g same as europe 3g. so if tmob europe is same as europe 3g then a europe g1 should work on att US 3g. am i coming thru clear or am i jumping all over?
Shaggy

Shagman68 said:
ok, my question is... Europe 3g is diff than tmob usa 3g, but is tmob europe the same 3g setup as US? and if europe 3g is same as tmob europe 3g, is att US 3g same as europe 3g. so if tmob europe is same as europe 3g then a europe g1 should work on att US 3g. am i coming thru clear or am i jumping all over?
Shaggy
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The American G1 has 3G support for HSDPA 1700 MHz & 2100 MHz, both bands I believe are used by T-Mobile. In Europe I believe they use only 2100 MHz band for 3G.
AT&T on the other hand uses 850 and 1900 MHz HSDPA
The phone has the capability for 2G at 850 and 1900 MHz, so technically it can be used on their network, just not at 3G speeds.
Although technically it's possible to design a Phase-Locked Loop to operate at a variable frequency and to be tuned with jumpers or something, it's probably cheaper for them or they might be subsidized to make phones so that they are exclusive for one network in the US.
To me the ideal is more about standardizing the protocols and the frequencies used for all companies, and having all bands available for traffic. But at least in the short-term that's not really good for business and so probably won't happen for a while.
This is all based entirely on a limited amount of research and my opinion, take it for what it's worth.

Europe uses 1900/2100 in a pair (1900 is the uplink, 2100 is the downlink). (source)
Most phones produced these days are tri or quad band and can work (almost) anywhere.. I'm surprised the G1 isn't.

Shagman68 said:
ok, my question is... Europe 3g is diff than tmob usa 3g, but is tmob europe the same 3g setup as US? and if europe 3g is same as tmob europe 3g, is att US 3g same as europe 3g. so if tmob europe is same as europe 3g then a europe g1 should work on att US 3g. am i coming thru clear or am i jumping all over?
Shaggy
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TonyHoyle said:
Europe uses 1900/2100 in a pair (1900 is the uplink, 2100 is the downlink). (source)
Most phones produced these days are tri or quad band and can work (almost) anywhere.. I'm surprised the G1 isn't.
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*sigh*.
Folks, you need to learn about UMTS bands before complaining about that the G1 or any other phone can't do this or that when it certainly can.
The G1 is a 3g worldphone. It works on the US 1700 AWS network (UMTS Band IV) and works on the world's 2100 network (UMTS Band I). ATT uses the 1900 Band (UMTS Band II).
Apparently the common names for these networks is being confused with the actual operating frequencies because they don't upload and download on the same frequencies. The 1900 band is not the same as the 2100 band, even though the 2100 band (UMTS Band I) uploads in the 1900mhz frequency and downloads at the 2100mhz frequency range. The 1900 Band (UMTS Band II) uploads on the upper half of the 1800mhz and downloads on the 1900mhz frequency range. UMTS Band II uploads on the frequencies that UMTS Band I downloads.
These bands separate.
TMO 3g band is different from ATT 3g band which is also different from EU 3g band.
The 1700 band (UMTS band IV) is actually made up of 2 frequency ranges like the other bands I and II are: 1700mhz and 2100mhz. In fact, the 2100mhz download range for UMTS Band IV is within the same frequencies used for the Band I download range, theoretically making it cheaper/easier for manufacturers who make Band I phones to "support" UMTS Band IV phone production.
Most phones produced today are NOT "tri or quad-band" 3g phones. In fact, I have yet to find a quad-band 3g phone. If quad-band 3g phones were made, they would be very likely to support the T-Mobile 3g network, because it's the 4th largest UMTS band type (behind Band I, II, and V). I would be very shocked to find a phone which was 2100/1900/900/850 instead of 2100/1900/1700/850.
And the G1 is a worldphone. It works just fine on UMTS in Europe. It is a band I and band IV device.
read these 2 links:
http://www.htc.com/www/product/g1/specification.html
http://en.wikipedia.org/wiki/UMTS_frequency_bands#UMTS-FDD
So to clarify, when you see a list of support bands, this is what you should interpret from those advertised bands:
2100 Band = UMTS Band I (The entire world outside of North America)
1900 Band = UMTS Band II (The Americas, ATT)
1700 Band = UMTS Band IV (The Americas, TMO)
900 Band = UMTS Band VIII (Australia)
850 Band = UMTS Band V (The Americas, ATT)
Outside of North America, the 2100 band is almost universally deployed, even where the 850,900,1700 or 1900 band is deployed.

[Q] [Noob question] Frequency bands

I work for Tmous retail sales and we have never really been taught anything about bands. Ive been pretty curious myself since some customers come into the store with AT&t phones asking about tmo service. I have been instructed (by a fellow retail associate) to tell them that no At&t phone will ever have 3G on tmo ( I assume thats just the safe answer though).
real question!
in terms of 3G/4G (hspa+) what bands does tmous use?
same question for AT&t.
To tie that together. ex: If a phone from At&t hypothetically has capabilities to use the same bands as tmous and is unlocked, can it get 3G/4G service on tmous?
i did search around and didnt find a very clear answer so i figured i'd start a thread, im sure other noobs have the same question.

T-Mobile uses 1700 2100 MHz bands for 3G/"4G"
AT&T uses 850 and 1900 MHz bands for 3G/"4G"
Yes if a phone has all those bands for 3G, and it's SIM unlocked you can get 3G on other cell company.
The T-Mobile Vibrant actually has those AT&T bands too, if you SIM unlock the Vibrant, you can get 3G on AT&T.
http://www.androidguys.com/2010/08/22/samsung-galaxy-unlockable-tmobile-vibrant-supports-att-3g/
It's very rare to see a phone that supports both T-Mobile and AT&T 3G bands.

nxt said:
T-Mobile uses 1700 2100 MHz bands for 3G/"4G"
AT&T uses 850 and 1900 MHz bands for 3G/"4G"
Yes if a phone has all those bands for 3G, and it's SIM unlocked you can get 3G on other cell company.
It's very rare to see a phone that supports both T-Mobile and AT&T 3G bands.
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Thanks for the clarification. In hopes that im not being a further nuisance, I was wondering, what about a phone that has 1 of the matching bands?
T-Mobile USA is using the 1700/2100 Mhz bands for 3G (UMTS)
T-Mobile Germany uses 1900/2100 Mhz for 3G (UMTS)
If you couldnt tell, im considering buying an iPhone (to develop on for fun). Will a phone that uses 2100 Mhz only be usable on USA towers (for 3G service)?

DrewMullen said:
Will a phone that uses 2100 Mhz only be usable on USA towers (for 3G service)?
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No it will not get 3G

[Q] HTC Amaze on ATT 3g/4g network

hi, im new to XDA. but does anyone here know if an unlocked TMobile HTC Amaze will work on ATT's 3g/4g network???
Please reply if you have any insight on this subject matter, thanks!!

Nope, tmobile bands are different from at&ts 3g/4g bands. I heard telus is getting it too and that one will work with at&t 3g/4g

walkinhotdog said:
Nope, tmobile bands are different from at&ts 3g/4g bands. I heard telus is getting it too and that one will work with at&t 3g/4g
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thanks for the info. so, Tmobiles hspa+ band is different from att's hspa+ band??

Can someone please confirm with an unlocked unit?

ljwnow said:
Can someone please confirm with an unlocked unit?
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I have an unlocked Amaze, and while you can insert an At&t 4g sim, it will not get any of the HSD**, it will only lock on 2G...very ssslllooowwww. Voice, not a problem, but the phone comes with T-Mobile data radio. I inserted my at&t SGSII sim.I even added all known APNs for at&t 3g/4g, nope...don't work
---------- Post added at 10:11 PM ---------- Previous post was at 10:03 PM ----------
DMX804 said:
thanks for the info. so, Tmobiles hspa+ band is different from att's hspa+ band??
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T-Mobile USA High Speed data bands: 1700 MHz/2100 MHz UMTS AWS
At&t High Speed data bands: 850 MHz UMTS/HSPA 3G 1900 MHz UMTS/HSPA 3G 700 MHz LTE 4G
They are different.
SOURCE: Wikipedia/Google
Hope this helps

Check the amaze forums
There is a thread on this in the htc amaze forum, they say it may be compatible. Also the box says that it carries the bands for at&t. Check out the thread http://forum.xda-developers.com/showthread.php?t=1300714

Topic was moved.
The operating frequencies on the HTC Amaze 4G are
GSM (2G)
850 Cellular Americas, Oceania, Brazil, Israel
900 Europe, Asia, Africa
1800 DCS Europe, Asia, Africa
1900 PCS Americas
WCDMA / HSPA+ 42 (3G / 4G)
850 Cellular / band 5 (V) Americas, Oceania, Brazil, Israel
1700 AWS / band 4 (IV) Americas
1900 PCS / band 2 (II) Americas
2100 IMT / band 1 (I) Europe, Asia, Africa, Oceania, Brazil, India, Israel
ATT operates in the US on:
2G: 850 MHz, 1900 MHz
3G: 850 MHz, 1900 MHz
4G: 700 MHz, 1700/2100 MHz
That is how you were supposed to answer a topic. Not assuming things you don't know nothing about just because you feel your gut tells you so.

[Q] 3G on Rogers Wireless

So yesterday I flashed this phone to ICS, its great, thanks guys!
However, I have a question about radio (I'm a software guy not a hardware guy).
Apparently, this phone supports Triple band UMTS 1700 1900 2100 MHz.
Rogers Wireless in Canada 'operates on the frequencies of 850/1900 MHz'
So, why can't I connect to Rogers Wireless with 3G speeds on the 1900mhz band? Does the phone require both 850 and 1900 MHz UMTS to operate 3G on a 850/1900MHz network?
The best connection I can get is EDGE and it's painfully slow...I bought this phone before I had a data plan with Rogers, so I never quite realized this issue...I guess I could just switch to WIND I just want to understand why it cant operate 3G over the 1900MHz band

3g needs 2 bands, one for upload and one for download. And that's why most phones, for example, bringing to the T-mo network you won't get 3g/ 4g speeds since it would need both the 1700/2100 bands and not a whole lot of non T-mo phones have these bands. So in your case a phone to run on Rogers with 3g would need both the 850 and 1900 bands.

the hardware should be able to operate at those frequencies but its software locked to 1700/2100 or 2100 mhz, so if you want 3g/hspa you must be on an operator which uses one of those 2 frequencies

Braccoz said:
the hardware should be able to operate at those frequencies but its software locked to 1700/2100 or 2100 mhz, so if you want 3g/hspa you must be on an operator which uses one of those 2 frequencies
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how do i software unlock it? Does cid uunlocking do this?

Although I haven't use it, I often see 4G Rogers data connection when I'm in Wind's "away" zone. Assuming there are no other models of MT4GS (with different radios) I'm rather sure this phone can use Rogers 3G network.

Forcing a Sensation Tmous 4G to 850mhz..?

I've seen that a few samsungs and european HTCs can do this through service mode, but is there any way to force the Sensation 4G to 850mhz? according to HTC, the modem in the phone does support AT&T frequencies and the carrier with the best connection only supports 850mhz in my country, and i reeeally don't want to buy a new phone.
i know it's a longshot, but it's worth trying.

Be careful, you don't want to ruin your device. Watch for overheating. Watch for force closes. Any signs And go back to normal. Be very cautious overclocking that much
Sent from my Sensation 4G using xda premium

Its not overclocking, its trying to get one of the cellphone frequencies.
FG

realsis said:
Be careful, you don't want to ruin your device. Watch for overheating. Watch for force closes. Any signs And go back to normal. Be very cautious overclocking that much
Sent from my Sensation 4G using xda premium
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i'm not talking about overclocking, it's the data modem, to put it simply, i need to be on AT&T frequencies but my phone is T-Mobile, and i've seen people change it according to their region. is it possible on the Sensation?

Well for starters the only way you would be able to operate on that frequency one your device has to be carrier free meaning unlocked from all gsm carrier's and this will allow your device to operate on that frequency meaning all you would have to do is swap sim cards if your device is carrier free and then you be able to put in AT&T sim card and reboot however you can't do this unless you are carrier free
sent from my sensation 4g using xda premium

The Sensation supports 850mhz for gsm. It does not support 850mhz or 1900mhz hspa (at least the us version does not support 1900 hspa, having aws instead).
So if you are using an att sim and want 850mhz, you would have to switch it to gsm only (although it'd only work with gsm anyway since att uses 850/1900 for hspa iirc, or maybe just 1900?).
Even then, it'd choose between 850 and 1900 depending on signal / area, etc.

ziddey said:
The Sensation supports 850mhz for gsm. It does not support 850mhz or 1900mhz hspa (at least the us version does not support 1900 hspa, having aws instead).
So if you are using an att sim and want 850mhz, you would have to switch it to gsm only (although it'd only work with gsm anyway since att uses 850/1900 for hspa iirc, or maybe just 1900?).
Even then, it'd choose between 850 and 1900 depending on signal / area, etc.
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meaning my sensation is confined to EDGE speeds on said networks??

Compatible networks GSM/GPRS/EDGE
850 900 1800 1900 MHz
UMTS/HSPA
850 1900 2100 or 900 1700 2100 MHz
HSDPA 14.4 Mbps
HSUPA 5.76 Mbps
tmo version supports 900/1700/2100.
looks like the other version not available in america supports 850/1900/2100 for umts.
not sure if there's any difference in hardware or if it's defined in software (not a part that's included in ruu's).

ziddey said:
Compatible networks GSM/GPRS/EDGE
850 900 1800 1900 MHz
UMTS/HSPA
850 1900 2100 or 900 1700 2100 MHz
HSDPA 14.4 Mbps
HSUPA 5.76 Mbps
tmo version supports 900/1700/2100.
looks like the other version not available in america supports 850/1900/2100 for umts.
not sure if there's any difference in hardware or if it's defined in software (not a part that's included in ruu's).
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Its a difference in hardware. The Canadian Bell version supports 850/1900 (AT&T Frequencies) You can use the T Mobile version but you will be limited to edge/2G only.