Database Users

Roaming Symbol Problem

I just recently bought a Rogers HTC Magic, rooted the phone, and unlocked it. Everything seems to work completely fine. At the moment however, I seem to be having an issue with a Bell Mobility sim card. Bell's HSPA sim works fine, and I seem to be able to use voice and data ok, but the problem lies in that their seems to be a roaming symbol ("R") on my reception bar. Im using the phone in my local calling area which is somewhat misleading to me.
Im using MyHero 2.0.5 ROM at the moment. Does anyone know why this is happening? Thanks in advance!

Agreed
I'm doing the same thing. I'm running cyanogens roms and I get the same thing. Best I can tell is that this is normal on the magic. Just be careful if you live near the border like I do.

I figured this was normal too. I guess i'll try other SIM cards to see what they say as well, thanks!

Ya I also have this phone running on Bell, wish I could get rid of the roaming. It also asks if I want to connect once in a while too.

Shouldn't the romaing be dictated by the sim? I have a bell sim, on the bell network, why do I get the roaming icon? is there a way to change the phone so it doesn't think it's a rogers and not roaming or something?

Are you sure you have the Bell APN Settings and not the Rogers Settings in the phone?
Settings -> Wireless Control -> Mobile Network Settings -> Access Point Names
If it says Rogers you're Roaming on the Rogers Network.

I put in the bell APN. I don't think we can even roam on rogers network, wouldn't work. Either way, it's the Bell APN.

I don't have a clue as to the differences between Bell and Rogers sims... but I can tell you that my HTC Magic, on Rogers, with a Rogers sim (duh), running Amon_RA's most excellent RAv1.6.2H only shows roaming when actually roaming.
I was in the US yesterday and watched it flip from a Rogers tower to ATT. I was watching to make sure it was not using any data when roaming on a US network. The symbol, lockscreen info and the carrier listed in the status pulldown all were updated correctly.
It might have something to do with the ROM you are running. However I bet that given the phone came from Rogers, it has some carrier info buried somewhere that it is comparing to the carrier you are on (Bell) and triggering the roaming status.
If you disable data when roaming in the settings menu, what does it do? If it disables data, then the phone thinks it is roaming, which would support my carrier data mixup theory.

I will try a different rom on the phone. Unless someone knows for sure what I can do to fix this.
If you disable roaming there is no data, because once in a while it prompts to connect, if you say no, you get nothing. Sometimes my wife must accidentally hit no (its her phone, she probably says no cause shes not sure what it does). I just want to make it so she does not get the prompt ever (settings are all set).

I have a rogers HTC Magic (unlocked) I'm using a fido sim, it thinks its roaming as-well but I have only fido apn settings. It only roams with certain roms and radio's. I can use alot of roms eg. cyanogen,Hero HOFO 308,GYD 2.1.1 without roaming but when I update radio and flash cursorsense roms it thinks it is roaming. I have to enable data roaming in order to get a 3G signal. as a fido user I dial *#123# to see if I'm in my local zone zone. A fido tech rep told me that most unlocked phones indicate roaming because of the phones hardware programing. The hard programing of the phones checks the sim and sees that it is using a diff sim card and starts indicating roaming when in fact you are not. A rogers salesman also told me the same thing. He said as long as your carrier is displayed on your phone homescreen then you are good.

I have the AT&T Tilt, not running the AT&T ROM. I've tested a few different SIM cards on my phone and here's what I've found:
Rogers: Roaming works correctly. In Canada, no roaming indicator, in the USA, roaming is indicated correctly.
Telus & Bell (HSPA): Roaming indicator always on.
I've heard that this may be due to the SIM card listing more than one Mobile Network Code: 302361, 302653, 302657 (original Telus CDMA networks, not compatible with the phone or any kind of SIM-based network so it's uncertain why it would be on the SIM card), PLUS the HSPA network code 302880. It's possible that the phone is not reading that far into the list on the SIM and therefore does not know that 302880 is a home network.

Tilt 2 Roaming Triangle and telus
I'm on Telus and have a Tilt2. The original ROM that came with the unit didn't show the roaming triangle. I have attached some screen captures of the ROM. I've attached a copy of the registry (Remove the .cab it was the only way I could get it to upload).
I'm now running Jackos rom and it does show the roaming triangle.
Hopefully somebody can find where the settings are located and hopefully it's contained in the registry.

Have the same problem on the Stocks ROGERS 1.5 Rom. Sales associate said you should not get roaming charges since you aren't actually roaming and if you do, just contact your phone provider.

rogers htc dream unlocked now on roaming?
i also have a htc dream from rogers unlocked not rooted and my bell sims card works like my phone calls and my text but i can't get my data to work and when i click on the apns theres not thing and i am not able to adjust anything in there, if anyone can help it would be great, so pretty much the bell sims card works but i cant use my data and it says im roaming

hol17 said:
Have the same problem on the Stocks ROGERS 1.5 Rom. Sales associate said you should not get roaming charges since you aren't actually roaming and if you do, just contact your phone provider.
Click to expand...
Click to collapse
i also have a htc dream from rogers unlocked not rooted and my bell sims card works like my phone calls and my text but i can't get my data to work and when i click on the apns theres not thing and i am not able to adjust anything in there, if anyone can help it would be great, so pretty much the bell sims card works but i cant use my data and it says im roaming
Click to expand...
Click to collapse
If you aren't outside of Canada and you get the roaming symbol; they can not charge you roaming fees.

Roger and Telus PLMN Compared
I'm not sure if this will help,
I have attached a picture of the PLMN from a Rogers sim and a Telus sim
Maybe someone knows how to adjust the information on these lists.

Dave778 said:
A fido tech rep told me that most unlocked phones indicate roaming because of the phones hardware programing. The hard programing of the phones checks the sim and sees that it is using a diff sim card and starts indicating roaming when in fact you are not. A rogers salesman also told me the same thing. He said as long as your carrier is displayed on your phone homescreen then you are good.
Click to expand...
Click to collapse
The phone companies in Canada must be less uptight about unlocked/rooted phones
If you asked those questions to a t-mobile or at&t rep, they would straight up refuse to talk to you
American cell phone companies are still stuck in the "Ma Bell" mentality, where everything that touches their network must be under their control

anyone figure out a fix? I'm having these roaming issues as well on the bell network with unlocked at&t phone.

I have Same probleme Here, Bell on a AT&T Tilt 2 phone, Always get Roaming message.
any registry edit or mod available to make it work without these message ?
thks

BiOs2k said:
I have Same probleme Here, Bell on a AT&T Tilt 2 phone, Always get Roaming message.
any registry edit or mod available to make it work without these message ?
thks
Click to expand...
Click to collapse
I searched around to a fairly moderate extent and I have found many people with the same problem, yet I can't find any resolution to this issue.
I'm not even sure where the issue lays. Is it with the hardware/firmware? SIM card? Windows Mobile? Is it the rilphone.dll? or maybe some registry entry. Maybe it's on the Bell network side?
Someone told me they put a Rogers SIM into their Fuze and it didn't show up as roaming, yet when they put a Bell SIM in, it's back to roaming. So what's the difference between Bell and Rogers?
Here's a question for anyone who has this problem, when you boot android does it still show as roaming?

Use T-mobile Htc Hd2 On AT&T 3G Network?

Hi guys, i have already searched the forums and cant find anything related to my title. Basically i would like to know if i could use my hd2 on at&t 3g network and how can i do it. I know i can unlock my hd2 by asking t-mobile but would it work on at&t? Thanks in advance

yeah it works on at&t network but not as 3g. It gets E which is the edge. If you search the forum there's a cab file that will program the phone so you can use data connection with at&t network. I got my phone unlocked via tmobile and have been using it with at&t for a couple weeks now without any problems.

SO you are basically saying that i can do anything i can already do with the phone on t mobile on at&t but except have 3g? So i would have to use edge as my data connection for internet? And how does sms work? Any settings to change to get it to work?

Install this cab file, its all you need to do
http://www.mediafire.com/?kmlmn4wt35m
These are the att settings everything will just work
on att, you can use gprs/edge , but of course no 3g

You have to have T-Mobile account to get the HD2....they don't sell them unlocked... after 40 days of use on a t-mobile account, t-mobile customer service will provide youw ith an unlock code, not before...

mearsfan5 said:
You have to have T-Mobile account to get the HD2....they don't sell them unlocked... after 40 days of use on a t-mobile account, t-mobile customer service will provide youw ith an unlock code, not before...
Click to expand...
Click to collapse
I'm wondering, if the radio can be flashed to support AT&T 3G band, or components are different...

alexsemi said:
I'm wondering, if the radio can be flashed to support AT&T 3G band, or components are different...
Click to expand...
Click to collapse
No, can't be flashed to work on AT&T 3G. You would have to get the Australian Telstra 9193 model which uses the 850 band that AT&T uses. That's the only way to use AT&Ts 3G with the HD2. The bands are set in the hardware.

digitallysick said:
Install this cab file, its all you need to do
http://www.mediafire.com/?kmlmn4wt35m
These are the att settings everything will just work
on att, you can use gprs/edge , but of course no 3g
Click to expand...
Click to collapse
Is there any settings/cab file for Rogers network in Canada?? Any help would be appreciated. Thanks

desiplaya172 said:
yeah it works on at&t network but not as 3g. It gets E which is the edge. If you search the forum there's a cab file that will program the phone so you can use data connection with at&t network. I got my phone unlocked via tmobile and have been using it with at&t for a couple weeks now without any problems.
Click to expand...
Click to collapse
how did you get the unlock code from t-mobile before 40 days of activation. That is what they told me when i asked for the unlock code. could you please share the secret....

mearsfan5 said:
You have to have T-Mobile account to get the HD2....they don't sell them unlocked... after 40 days of use on a t-mobile account, t-mobile customer service will provide youw ith an unlock code, not before...
Click to expand...
Click to collapse
this is incorrect. anyone can get the hd2 without contracts @full price of 450 plus tax. they will also unlock it in 1 to 5 days if you paid full price.got mine from wirefly, and had it unlocked in 2 days.

miguel4u2 said:
Hi guys, i have already searched the forums and cant find anything related to my title. Basically i would like to know if i could use my hd2 on at&t 3g network and how can i do it. I know i can unlock my hd2 by asking t-mobile but would it work on at&t? Thanks in advance
Click to expand...
Click to collapse
i have unlocked my t-mobile htc hd2 and used on att network, all works fine but not 3g.

alsalahi said:
i have unlocked my t-mobile htc hd2 and used on att network, all works fine but not 3g.
Click to expand...
Click to collapse
I have an HD2 on AT&T and everything works, but not fine! If I am browsing the internet and the phone tries to update the weather or mail, really anything else that accesses data in the background it will stop my data connection everywhere. It seems the only way to fix this is a hard reset sometimes, at the very least I have to exit the browser, open the task manager, kill everything, and turn off the data connection in the wireless controls and turn the data back on... My questions to the others who are using this phone on AT&T are 1) are you experiencing the same problems? 2) What did you do to fix this. I have installed the above mentioned cab file for settings and I have also manually entered the settings. I would love the phone even though it only has EDGE except it cant hold a data connection for more than 10 minutes at a time.

profclean2000 said:
I have an HD2 on AT&T and everything works, but not fine! If I am browsing the internet and the phone tries to update the weather or mail, really anything else that accesses data in the background it will stop my data connection everywhere. It seems the only way to fix this is a hard reset sometimes, at the very least I have to exit the browser, open the task manager, kill everything, and turn off the data connection in the wireless controls and turn the data back on... My questions to the others who are using this phone on AT&T are 1) are you experiencing the same problems? 2) What did you do to fix this. I have installed the above mentioned cab file for settings and I have also manually entered the settings. I would love the phone even though it only has EDGE except it cant hold a data connection for more than 10 minutes at a time.
Click to expand...
Click to collapse
Well due to the type of connection that EDGE is, you cannot be on the internet and talk on the phone at the same time. This would also go for all applications that use the data connection...only one at a time. This was the case on the pre-3G phones like the HTC Wizard (Cingular 8125).

alsalahi said:
i have unlocked my t-mobile htc hd2 and used on att network, all works fine but not 3g.
Click to expand...
Click to collapse
i am using the same phone. unlocked it and used att isp to use network. it shows E as edge network but sometimes it shows G in it. i dont know why but it shows G in some places and works better.. does anyone know what is that and why it happens. can i do anything to get G everytime? i use my phone in texas USA

praym said:
i am using the same phone. unlocked it and used att isp to use network. it shows E as edge network but sometimes it shows G in it. i dont know why but it shows G in some places and works better.. does anyone know what is that and why it happens. can i do anything to get G everytime? i use my phone in texas USA
Click to expand...
Click to collapse
The phone cannot and will not get 3G when used on the AT&T network, despite what your icons show...the hardware simply isn't capable. Period.

Bought my unlock code through ebay for $14.00 and had the phone unlocked in 20mins. HD2 works great now.

praym said:
i am using the same phone. unlocked it and used att isp to use network. it shows E as edge network but sometimes it shows G in it. i dont know why but it shows G in some places and works better.. does anyone know what is that and why it happens. can i do anything to get G everytime? i use my phone in texas USA
Click to expand...
Click to collapse
G = GPRS
E = EDGE
look them up on wikipedia if you want more info but.....
GRPS is older and slower than Edge, GRPS max speed in ideal conditions is somewhere i the upper double digits/ lower triple digits. You might be lucky to get into the 200kbps range with EDGE.
In the end both suck compared to being able to get tmobile's 3g signal which ive personally seen hit 5mbit/s here in tampa now that HSPA+ is deployed. Being able to get ATT's 3g might get you right around 1mbit if lucky. I dont know what if any plans ATT has for HSPA+ deployment

digitallysick said:
Install this cab file, its all you need to do
mediafire.com/?kmlmn4wt35m
These are the att settings everything will just work
on att, you can use gprs/edge , but of course no 3g
Click to expand...
Click to collapse
(edited url cause I can't post as a new user)
I used this .cab file and while I can browse the web, I can't seem to send MMS pictures using my AT&T sim, are there other settings I have to change?
EDIT: I found the answer here, after a bit more searching! Thanks all, forum.xda-developers.com/showpost.php?p=6695081&postcount=13

I just bought the hd2 and planning on unlocking it to work on AT&T. I know that I will be getting Edge instead of 3g. But can someone plz explain to me how does it work as far as data plans and mms. Do i need to have a data plan to send mms or mms will be sent through edge. and as for data and web browsing , do i have to have a data plan or since when i go online i will be on edge so i dont need a data plan

mearsfan5 said:
You have to have T-Mobile account to get the HD2....they don't sell them unlocked... after 40 days of use on a t-mobile account, t-mobile customer service will provide youw ith an unlock code, not before...
Click to expand...
Click to collapse
90 Days, unless they changed it. 3 phones unlocked, 90 days between each.

[Q] How to Unlock my mobile network settings?

Hi,
I recently bought a HTC Surround (AT&T), im from Costa Rica and we don't have AT&T as a carrier.
The phone works great with the GSM band but when i try to look for any 3G settings (using 850Mhz band) i cant find any options.
According to an article in the internet (i cant post any links yet) there should be an option called "Mobile Network" where i can turn the 3G on or off, so im guessing AT&T disabled the option (phone doesn't have any 3G sign on the sign bar at the top just the antenna bars).
Is there any way to Unlock the 3G options on this phone?
Thank you.

Help me out a little with your request. The place to turn on/off data is under cellular in the settings page. However, I haven't found "Mobile Network" on mine. However, I did download HTC Connection Setup which allowed the phone to search for various carriers and automatically set up the connections. That program is in Marketplace under HTC apps.
BTW, is your phone SIM unlocked?

Thank you for answering ...Sure ill help you with what ever you need... we might be able to narrow down my problem... lets see
1. HTC connection: yea i tried the app actually i have it installed on my phone but its giving me a message saying "Carrier doesnt exist in the data base" that i need to go a create apn (isnt that for phone internet). so i cant use the application, our carrier here is called I.C.E.
2.The band Costa Rica is using for 3G is the 850MHz. my SIM card is linked to a GSM account (1900 MHz) but the phone should be able to recognize the band tho, isnt that right?
3.how do i know if my phone is sim lock? i just placed my GSM SIM card inside and its working, do i need to try with a different card?
4. how does 3G works in this phone? is it configurable?

I'm pretty sure you are going to have to configure an APN for it to use 3G. As for band switching, I don't think it's possible with the current interface (at least on AT&T). Perhaps there are some registry entries that we will soon be able to access when some of the WP7 developers make headway, but right now, there is nothing of which I'm aware. If you can call on your network, the phone is already SIM unlocked, so no need to worry there.

I found some nice info about switching 3G or 2G etc... which it helps but i think it didnt work on mine.
Does anyone know how to set the HD7 (or surround) to 3G only?
Dialer> ##3282# Call > Settings > 3G only.
But in my case what i saw after that was that all the antenna bars were gone and then it went into no service then picked up signal again. After checking the settings after dialing again it was set to automatic again and if a switch it to 3G only it does the same thing again.
So im guessing it didnt work, ill try to talk to my carrier and see if we can create an APN to handle the 3G.
Is there a chance that the 3G feature is locked by AT&T?
Thanks for all your help if by any chance you find out something else i will appreciate the help.

Well apparently i got it fixed my phone seems to be working on 3G right now, i have the 3G sign on the top bar.
To make the story short.
I just configured my internet, added the roaming options and then tried again ##3282# only 3G and it worked now its showing 3G next to the antenna bars.
Thank you jwzg for your help.

Can not change the language
I have HTC surround. I did unlock AT&T phone. Now it works in Russia.But when I'm changing the languge from enlish to russian: can not save it. Please help me

need help
i have a question and i need some help pease... i have and htc surround which was unlocked from att and now am using t-mobile with the phone however i do not get 3g working what can i do is there any fix for it?

xSebast said:
Hi,
I recently bought a HTC Surround (AT&T), im from Costa Rica and we don't have AT&T as a carrier.
The phone works great with the GSM band but when i try to look for any 3G settings (using 850Mhz band) i cant find any options.
According to an article in the internet (i cant post any links yet) there should be an option called "Mobile Network" where i can turn the 3G on or off, so im guessing AT&T disabled the option (phone doesn't have any 3G sign on the sign bar at the top just the antenna bars).
Is there any way to Unlock the 3G options on this phone?
Thank you.
Click to expand...
Click to collapse
Hi. If your SIM card is old (GSM) add APN: icecelular. If your SIM card is new (Kolbi), add APN: kolbi3g

jaraya13 said:
Hi. If your SIM card is old (GSM) add APN: icecelular. If your SIM card is new (Kolbi), add APN: kolbi3g
Click to expand...
Click to collapse
hi guys
I living to Costa Rica and i have a HTC Surround 3G network not problem apn icecelular
so MMS messenger is a problem, how is the configuration ??????

geovannyguadamuz said:
hi guys
I living to Costa Rica and i have a HTC Surround 3G network not problem apn icecelular
so MMS messenger is a problem, how is the configuration ??????
Click to expand...
Click to collapse
that's easy no problem just download this app from the market is called connection setup I believe then just open it and follow instructions however I have a big question am in US and have an htc surround unlocked from att but I have t mobile and I cannot get 3g is there any setup configuration that has to be make in order for the 3g to work

Thanks!!!
Download connection setup to marketplace and running
the carrier doesn´t exist in database
In Costa Rica mms don´t support ???

geovannyguadamuz said:
Thanks!!!
Download connection setup to marketplace and running
the carrier doesn´t exist in database
In Costa Rica mms don´t support ???
Click to expand...
Click to collapse
I guess not, we have to wait for a custom rom the adresses this issue.

map1989 said:
that's easy no problem just download this app from the market is called connection setup I believe then just open it and follow instructions however I have a big question am in US and have an htc surround unlocked from att but I have t mobile and I cannot get 3g is there any setup configuration that has to be make in order for the 3g to work
Click to expand...
Click to collapse
No, you don't have to do any special configuration. I think TMobile bands for 3G are different frequencies from ATT, so sadly, I think you are never going to be able to have 3G connection on your Surround while you are on TMobile. Regards.

mmmmm tmobile used different bands
mmmmm input to sim movistar in htc, rigth in connection setup appers to configuracion of Nicaragua chance to Costa Rica and input sim ice connection don´t exist in data base... :-( mms is not working!!!

[Q] Omnia 7 AT&T issues USA

I just got my Omnia 7 in the mail today and called AT&T to get it activated. When they tried to look up the Omnia 7 in their system nothing came up. The system said it was an unknown manufacturer and it had know idea what it was. Has anyone encountered this or did the person I talked to not know what they were doing? They got the edge network to work but because it is not recognized as a smartphone they couldn't give me a 3G data plan. I thought I read on other threads on here that they have gotten the Omnia 7 to work on AT&T with 3G in the US. Any help would be greatly appreciated.

dmacke said:
I just got my Omnia 7 in the mail today and called AT&T to get it activated. When they tried to look up the Omnia 7 in their system nothing came up. The system said it was an unknown manufacturer and it had know idea what it was. Has anyone encountered this or did the person I talked to not know what they were doing? They got the edge network to work but because it is not recognized as a smartphone they couldn't give me a 3G data plan. I thought I read on other threads on here that they have gotten the Omnia 7 to work on AT&T with 3G in the US. Any help would be greatly appreciated.
Click to expand...
Click to collapse
just don't let them recognize it as a smartphone
get off the phone and log on to the online system
add the data plan for non-smartphone
then use it!
its unlimited and its cheaper

fsrkewd said:
just don't let them recognize it as a smartphone
get off the phone and log on to the online system
add the data plan for non-smartphone
then use it!
its unlimited and its cheaper
Click to expand...
Click to collapse
That is what I tried to do but for some reason the data won't work on my phone. I double checked my account online and the data is turned on but so far no luck on my phone. I can make calls and text just fine but the data doesn't want to work (EDGE nor 3G). The tech support person said that some cell towers were down but should be fixed by now. Any advice?

Did you use Samsung's netorking tool to select the right network (AT&T)?
There are also some manual APN settings.
Do you have an unbranded phone?

dmacke said:
That is what I tried to do but for some reason the data won't work on my phone. I double checked my account online and the data is turned on but so far no luck on my phone. I can make calls and text just fine but the data doesn't want to work (EDGE nor 3G). The tech support person said that some cell towers were down but should be fixed by now. Any advice?
Click to expand...
Click to collapse
Since the omnia 7 only support one of the two 3g band that at&t use (1900), maybe your area use 850 instead of 1900. Where are you located?

nickschot said:
Did you use Samsung's netorking tool to select the right network (AT&T)?
There are also some manual APN settings.
Do you have an unbranded phone?
Click to expand...
Click to collapse
I downloaded the network tool and it was set to telecom.de so I switched it to AT&T and that got my data working (just EDGE network). Where would I find what APN settings at? I found some APN settings:
apn: wap.cingular
username: [email protected]
password: CINGULAR1
were these the ones I was supposed to use? As for having an unbranded phone there are no stickers or logos on the back but on boot up it has the T-Mobile logo which would explain the telecom.de correct? Thanks for all your help.

fsrkewd said:
Since the omnia 7 only support one of the two 3g band that at&t use (1900), maybe your area use 850 instead of 1900. Where are you located?
Click to expand...
Click to collapse
I am in Kansas City, MO which is a fairly large market. I looked at some maps from 2004 of the different frequency bands and Kansas City had both 850 and 1900. I appreciate your help.

I've got (or better said had) a Omnia 7 from Deutsche Telekom too (they are cheap ). I live in Europe though, so I dont know much about AT&T and their 3G bands. The T-Mobile branding is actually nothing more than the boot logo, some default apps, the search page and default settings for things like MMS and networking.
You can get data working by using the networking tool, but I could not get MMS to work without flashing a retail rom with the right retail CSC for my country. Or well, you can get it to work when you hack on ADC in the registry...

Enable 3G on DVP for ATT with TMO DVP

I have a DVP from Tmobile that I bought and unlocked it for ATT. I cannot get the 3G to enable on it.. Is this not possible? From what Ive read it looks possible..
I've add the APN settings, went to the ##3282# and set 3g and it fails to turn the radio back on,.,. Then reverts to 2G or mixed but never pulls a 3G signal.

Sorry, not possible. That is why there are two different versions. The hardware is slightly different.

PCS vs AWS

3g on a Tmobile phone on the ATT network
Yes you can get 3g on a tmobile phone that is on the att network. Go into settings cellular than edit apn. The only apn setting needed is wap.cingular no user name or password. This setting got me 3g. I do have a prerelease phone but that shouldn't matter.
wap.cingular

Well.. I read your last post about 45 seconds too late.. Just sold the phone to someone and they just walked out my door

xandrevvx said:
Well.. I read your last post about 45 seconds too late.. Just sold the phone to someone and they just walked out my door
Click to expand...
Click to collapse
You wouldnt have got 3G on at&t, different radio frequencies and AFA we know the dell is not penta-band. Changing the APN wont work on a T-Mo DVP.

Like efjay said, AT&T and T-Mobile uses different frequency so you'll have to buy Dell Venue Pro with T-Mobile band.