Hey everyone!
So I am a little new when it comes to the issue of WiMax 4G.. I'm in Orlando, which has 4G, and I am able to successfully able to connect with the 4G radio (though I do find myself dropping from 4G to 3G depending on the area I'm in).
When I am sitting at my desk at work, I can send myself an e-mail to my google account and not receive the push notification that it had arrived. I've been testing this over the past couple days and noticed that when I would pick up my phone (still connected to 4G, by the way, though there are no "bars") and load up some application that polls for data, such as Facebook, the sync would then occur and I would get the notification.
So my question is this: Is this the expected behavior of the 4G radio? Does it sit in an "idle" state when not being used, which would then restrict it from receiving push notifications? I did disable 4G at my office and the data connection seems more reliable (push notifications are immediate).
I've had this phone for only three days, so I'm giving it a couple weeks to see if I might need to exchange the phone, but I figured I'd see if anyone more knowledgeable than myself could shed some light on things.
Thanks!
- Andy
from what I know if you are bouncing back and forth from 4g to 3g then in that part of the area you have very weak 4g signal and better off just sticking to 3g in that part of the building. it could be that since its bouncng back and forth that its not pulling the data automatically like it should.
[UPDATE]
I'm resurrecting my own thread, because after another week of testing on multiple devices (total 2 Shifts and a 2 Epics), I'm ready to make the following statement:
Sprint Android 4G phones do not reliably push using their WiMax radios.
I've tested this in several different ways, with both my Shift and my buddy's (rooted 2.2) Epic. My actual test went something like this:
- Find a place with at least one "bar" of 4G (listed as fair, though this is repeatable outdoors as well, just easier to do next to the computer)
- With 4G OFF, send myself a message to my GMail account. The notification happens on the PC instantly, and anywhere from 1-20 seconds later on the shift.
- Turn on 4G radio. Send another e-mail to the GMail account. This time, no notification hits the phone (I waited at least a minute before continuing to the next step).
- Run Speed Test (I contacted the helpful HTC support desk, who actually told me that I might be on 3G even though I see the little 4G radio icon). This last run I register 3.6Mbps down and about 1Mpbs up. That's not 3G. At this point in the test, I received my e-mail notification once in the 10 or so times I tried this. The other nine times I STILL had not received my notification.
- At this point, if I wanted to see the message, I either switch off 4G or manually refresh the GMail application.
Note that this test was repeatable on my phone on GTalk, Voice, and the new Android Market (downloading apps from PC) as well. The Epic only did this test twice; once indoors with GMail and once outdoors with GMail, but I imagine the other push applications would behave exactly the same way.
I wanted to be ABSOLUTELY sure about this before bringing this thread back, but now that I am, here's the question: Anyone with 4G coverage, can you repeat these findings, and is this the intended functionality of the 4G radio?
Sprint tech support (who I also contacted) indicated to me that I should be able to push on 4G, as did HTC, so maybe I'm missing something here. In any case, I figured this was the best place to ask.
- Andy
Just did some testing for you. Disconnect 3G, wireless and only enabled 4G. Sent an email from my exchange server to myself and it pushed to the phone in a couple of seconds. I replied from the phone and it was in my outlook again in a few seconds.
So at least 4G and exchange work fine.
RyteSyde said:
Just did some testing for you. Disconnect 3G, wireless and only enabled 4G. Sent an email from my exchange server to myself and it pushed to the phone in a couple of seconds. I replied from the phone and it was in my outlook again in a few seconds.
So at least 4G and exchange work fine.
Click to expand...
Click to collapse
I wish I had an exchange server I could have tested with as well. As I mentioned, I used only GMail, GTalk, Google Voice, and Market. Among the things I looked at was the field labeled "Standby Time" in the WiMax section in ##DATA#. I haven't messed with it (default 10 minutes), but if you're willing, can you set to 4G, wait this timeout interval, and attempt your test again? I'm trying to put the puzzle pieces together.
Also, I haven't entirely ruled out either my device or my area, yet I do think it strange I can repeat this with another device simultaneously, with both having 4G signal.
- Andy
AndyRoss said:
I wish I had an exchange server I could have tested with as well. As I mentioned, I used only GMail, GTalk, Google Voice, and Market. Among the things I looked at was the field labeled "Standby Time" in the WiMax section in ##DATA#. I haven't messed with it (default 10 minutes), but if you're willing, can you set to 4G, wait this timeout interval, and attempt your test again? I'm trying to put the puzzle pieces together.
Also, I haven't entirely ruled out either my device or my area, yet I do think it strange I can repeat this with another device simultaneously, with both having 4G signal.
- Andy
Click to expand...
Click to collapse
Same result. Also GMail is notifying just fine though not as fast as exchange, but still less than a minute. Have you tried turning off mobile network (3G)? Then you'll know you're only on 4G for sure. You can add the widget under widgets >> settings >> mobile network.
RyteSyde said:
Same result. Also GMail is notifying just fine though not as fast as exchange, but still less than a minute. Have you tried turning off mobile network (3G)? Then you'll know you're only on 4G for sure. You can add the widget under widgets >> settings >> mobile network.
Click to expand...
Click to collapse
Thanks for checking into that for me. I will try disabling 3G at work tomorrow (I would do it from home, but I typically don't get 4G where I live). Also just verifying, you were testing with 3G on as well, or only off? One of the things I was theorizing was that push notifications were being "handled" by the 3G radio, but since 4G was on, they weren't being processed until that radio was reactivated.
In either case, I have something else to test, so thanks again!
- Andy
AndyRoss said:
Thanks for checking into that for me. I will try disabling 3G at work tomorrow (I would do it from home, but I typically don't get 4G where I live). Also just verifying, you were testing with 3G on as well, or only off? One of the things I was theorizing was that push notifications were being "handled" by the 3G radio, but since 4G was on, they weren't being processed until that radio was reactivated.
In either case, I have something else to test, so thanks again!
- Andy
Click to expand...
Click to collapse
the way I did it was to have only 3G on, do the tests, turn 4G on, do the tests, turn 3G off, do the tests, leave phone alone on 4G and let it be (items still notified).
Glad to help.
Related
Any way to accomplish this?
I need this BAD too! Reception at work is god awfull. Please help! SOS
What does your user name mean? Natural light or natty boh light?
Please someone make an app to turn on/off roaming; I'm willing to pay money for it (and I'm sure a lot of people are willing to do so too).......
LOL if it were this easy.......
Roaming is of no use to me but I always like to look in to issues that people are having. I grep'd what code we have available to us for our phones and the only two options I came across were:
ro.com.android.dataroaming = true
xml: name="sync_while_roaming">false
So all I can tell you is that I can control whether it roams or not (which can also be easily changed in our settings menu) but not to force it to roam. I googled if it was possible in android at all and couldn't find any results.
Do you know what towers are around you or what towers we can roam on? I wonder if it would be possible to hack in a verizon rom dump from eris and force it to roam on their towers. However that won't allow you to come back to Sprint. And Sprint has been known to cancel contracts of people who roam too much.
has anyone tried to update the PRL to a verizon PRL?? I tried it, but i'm not sure how successful it was, as both Sprint and Verizon signals are strong in my area.. Put the PRL on the SD card and use ##PRL# to update it..
flipzmode said:
Roaming is of no use to me but I always like to look in to issues that people are having. I grep'd what code we have available to us for our phones and the only two options I came across were:
ro.com.android.dataroaming = true
xml: name="sync_while_roaming">false
So all I can tell you is that I can control whether it roams or not (which can also be easily changed in our settings menu) but not to force it to roam. I googled if it was possible in android at all and couldn't find any results.
Do you know what towers are around you or what towers we can roam on? I wonder if it would be possible to hack in a verizon rom dump from eris and force it to roam on their towers. However that won't allow you to come back to Sprint. And Sprint has been known to cancel contracts of people who roam too much.
Click to expand...
Click to collapse
The towers around me are Verizon towers. Yeah, I undestand that (Sprint has been known to cancel contracts of people who roam too much) and I don't want to Roam all the time, just here at work. The phone is mostly on roaming while at work but is is continually searching for a Sprint tower and that drains the battery so fast! The only workaround for me is to set the phone to airplane mode until about the last three hours of work but then even when the phone is turned on it constantly tries to switch to a very weak sprint signal and I keep losing connection just about every 2 or 3 minutes, so using the phone in work is practically useless for me right now
@mroneeyedboh: Natural Light. My ode to cheap beer.
One area I frequent has a weak Sprint signal, and a "decent" Verizon signal. It would take "excessive" roaming, for 3 consecutive months for Sprint to flag you for abuse. So you have some breathing room. I remember my G1 had an option to manually select the network available. However, I'm not entirely sure that having a network option isn't just a customary feature of a GSM device, and not Android specifically, since its obviously compatible world wide.
I have the same exact situation at work where I get no signal on sprint but it tries to find it draining the battery and preventing it from using the very good verizon signal. I had to force it to EVDO only just to be able to check my gmail and confirm my XDA forum registration since webmail is blocked at work. This the kind of thing I bought this phone for to always have access to my email. Switching to EVDO Only mode is really cumbersome and annoying, and still gives a bad although slightly better signal. If I forget to switch it back to allow 1x Data, I can't use SMS and when I call sprint it hangs up immediately unless I switch it back on. I would use very minimal time data and voice roaming compared to my outside of building data and voice use as I'm sure is the case for most people with bad sprint coverage inside buildings.
Greefus said:
I have the same exact situation at work where I get no signal on sprint but it tries to find it draining the battery and preventing it from using the very good verizon signal. I had to force it to EVDO only just to be able to check my gmail and confirm my XDA forum registration since webmail is blocked at work. This the kind of thing I bought this phone for to always have access to my email. Switching to EVDO Only mode is really cumbersome and annoying, and still gives a bad although slightly better signal. If I forget to switch it back to allow 1x Data, I can't use SMS and when I call sprint it hangs up immediately unless I switch it back on. I would use very minimal time data and voice roaming compared to my outside of building data and voice use as I'm sure is the case for most people with bad sprint coverage inside buildings.
Click to expand...
Click to collapse
There is a widget in the market to switch 3g on and off. can't remember the name.
Anyone who's more knowledgeable than me, can please tell me if by changing anything in the ## menus, (like ##diag# or ##data#), can we force the phone to roam? (I'm asking because I just got the MSL number out of my device and now can change any of those settings).
TIA.
daveli said:
Anyone who's more knowledgeable than me, can please tell me if by changing anything in the ## menus, (like ##diag# or ##data#), can we force the phone to roam? (I'm asking because I just got the MSL number out of my device and now can change any of those settings).
TIA.
Click to expand...
Click to collapse
Sorry, can't help you. I interested in this thread, so I'm bumping it.
This sounds like something the CDMA radio manages. I'm not familiar with the lower level processes and configurations on Android, but this might be part of a closed source process. I don't know if Android is supposed to have such a thing?
You could try setting the Home SID/NID to the SID/NID of the tower where you work, and then set the phone to Sprint Only. This in theory should force the phone to stay on the roaming tower, but I'm not sure if this will override the PRL. Probably not.
Subscribing... I would give anything for this. I got this shiny new hero and can't use it at my house. It was so awesome that I kept it. A friend can sit next to me on verizon and get almost a full signal.
I have tried the GV + Sipsorcery + sipdroid thing to make and receive calls over wifi but it is so unreliable. If I could just switch to use the roaming verizon tower by my house I could justify keeping this thing.
I am new to android development, but not new to development, linux, or java. So I will probably investigate this more.
flexgrip said:
Subscribing... I would give anything for this. I got this shiny new hero and can't use it at my house. It was so awesome that I kept it. A friend can sit next to me on verizon and get almost a full signal.
I have tried the GV + Sipsorcery + sipdroid thing to make and receive calls over wifi but it is so unreliable. If I could just switch to use the roaming verizon tower by my house I could justify keeping this thing.
I am new to android development, but not new to development, linux, or java. So I will probably investigate this more.
Click to expand...
Click to collapse
Anyone looking into what someone else found? That he was able to force roam the Hero?
http://forum.xda-developers.com/showthread.php?t=616405
I am hopefull
Apart from force roaming does anyone know of an app that would let you manually select your towers (or a built in way to do it).
I don't want to force roaming actually, I just want to switch to the verizon tower near my house so I can use my phone at home. I don't want to do it anywhere else. Just once instance.
I had a junk nokia a long time ago and it even had an app that let you manually select your tower and gave me all the serial/id info about it. What is the next closest think on android for this?
flexgrip said:
I don't want to force roaming actually, I just want to switch to the verizon tower near my house so I can use my phone at home. I don't want to do it anywhere else. Just once instance.
Click to expand...
Click to collapse
That is, by definition, force roaming.
Oh, you're right, but what I meant was that I don't want to be anywhere and kick myself off the sprint towers onto any other tower using an app or setting. I just meant in one location I would like to switch to a defined tower. There is a big difference between an app that lets you select your network towers and another that forces your phone off of sprint onto any roaming tower. But thanks for a helpful post.
As far as the CDMA hero goes, is there anything helpful in the radio updates that might lead to controlling the network selection? I am wrapping some projects up this week and I do not care to dig through the source to see if a quick app is possible.
I'm pretty sure you should NOT mess with the radio...
flexgrip said:
Subscribing... I would give anything for this. I got this shiny new hero and can't use it at my house. It was so awesome that I kept it. A friend can sit next to me on verizon and get almost a full signal.
I have tried the GV + Sipsorcery + sipdroid thing to make and receive calls over wifi but it is so unreliable. If I could just switch to use the roaming verizon tower by my house I could justify keeping this thing.
I am new to android development, but not new to development, linux, or java. So I will probably investigate this more.
Click to expand...
Click to collapse
Or, you could call customer care, and tell them that you get no service at home, and require an AIRAVE. They sent me one free, and waived the 4.99 month charge. Just explain to them, you need your phone, you have small kids or whatever, you need service in your home.
AIRAVE is the best thing ever. I went from no service in my house, to 5 bars at all times, who cares if its only 1X, I can still make and receive calls, and have WiFi for my data needs.
Is this normal?
Service: TMOUS
Phone HTC HD2 Latest 2.13 Rom
I'll try to make this as short as possible.
Connectivity issues everywhere but work.
I have been speaking with T-mobile for atleast 3 weeks about my ongoing data connectivity issues, I rarely had 3g except for at work, and edge worked most of the time except for random data outages that seemed to last about 30 min or until I rebooted the device.
So about a week ago I had 2 more Service requests opened, you need 3 in order to aquire a trouble ticket with t-mobile. About 1-2 days after having these service requests opened, I started receiving pop ups "unable to connect to epc.tmobile.com" I would then have to manually turn my data connect back on, upon trying to power it on, it would prompt me to manage my connections or create a new one, I would then have to edit the apn and resave it.
So I thought well lets try one of the other apn's same issue except no pop up, my data connection would just drop, and I would have to turn it on and off 3 or 4 times. So I wiped the device and restored back to orginal settings- same issue.
I called t-mobile yesterday to check the status of my tickets after not being called back as promised for like the 8th time, I ended up telling the story to about 7 different people, Eventually coming to the conclusion that they first want to send me a replacement. So ok no big deal $10 bucks for shipping and $10 bucks to replace my armor. Lo and behold today it works amazing not 1 3g drop, slacker has not stopped playing in the middle of a song and my data connection has not randomly turned off.
EXCEPT
When I send or receive data in the form of a text msg.
Data will totally drop, It will come back as soon as I try to browse the web or wait about 5-10 minutes.
Any ideas?
If it isn't full 3G, then the data connection will pause to receive the text message.
rp-x1 said:
If it isn't full 3G, then the data connection will pause to receive the text message.
Click to expand...
Click to collapse
How can you tell if its full strength? I read that the bars do not mean that 3g is full strength, just that the cell service is.
Either way, I have full bars and it does this at any location I test from.
It's just strange that everytime I speak with T-mobile my phone symptoms totally change.
borguo said:
How can you tell if its full strength? I read that the bars do not mean that 3g is full strength, just that the cell service is.
Either way, I have full bars and it does this at any location I test from.
It's just strange that everytime I speak with T-mobile my phone symptoms totally change.
Click to expand...
Click to collapse
Sorry, I meant when it is EDGE or GPRS, rather than HSDPA/3G.
Sometimes mine pauses a 3G connection too, but not all the time.
rp-x1 said:
Sorry, I meant when it is EDGE or GPRS, rather than HSDPA/3G.
Sometimes mine pauses a 3G connection too, but not all the time.
Click to expand...
Click to collapse
Ahh ok I see, good to know it shouldn't do it all the time , especially at places it did not happen prior.
Tested my gf's HD2 which is currently half way across Phoenix, Arizona. She now has the same disconnect from data problem after receiving a text with a picture.
Went to a sprint store (appointment) and they told me that when I am connected via wifi at home, it will not be able to receive text notification and will not be able to see my picture (I have the download button showing but will not open the picture when I click on it). So this means, that when I have wifi connection at home, that disables the 3G connection that I have thus not seeing the Sprint's server where the text are delivered. Aren't the text messages via the 3G or 4G connectivity on the phone. So my wifi connection will not allow the 3G connection on the phone. I tested sending a picture message from my Epic to my Tilt2 (AT&T) windows phone with the same wifi connection and I get the notification and I have to click on the icon to display the picture with no problem. But the epic as I have explained earlier, will give me no notification, it gives me a download button when I open up the text message - but will not do anything at all - not opening the picture. when I disable my wifi - no problem
I need to test this, because if it's true thats bull****, I have Wifi at home on all the time. Heck if Sprint is going to start capping the unlimited plans, why force us to use 3G at all times when there's wifi available? testing this...
yea you're correct, it shows the button if you go into the messages, but it wont notify or let you download it, it says failed. Thats garbage.
Thanks Six-Duece and so I am not the only one. Somehow, if you are connected via wifi, the 3G or even 4G (data connection) is somehow disabled.
Thanks once again.. I am going to return my phone since I am still within the 30-days.
and I notieced even here in Vegas that 4G connection is so flaky and always reverts back to 3G and I pay $10 for something that is not used.
Maybe one day, when 4G connectivitiy is much more stable, then the $120/yr would be worth it. $120 is not joke nowadays
This is a problem for me also. People have told me it has something to do with sprint/android users, which I dont see how thats the case when I have been with sprint for over 3 years now and this is the only phone that has happened to me on.
I have owned the HTC EVO, Touch Pro, Touch Diamond, and Palm Pre on Sprint's network and non had made me turn wifi off in order to recieve pictures. (HTC EVO = Android device)..
Also it seems to let me SEND pictures with wifi on just not RECIEVE.. It sucks & hope someone will figure out a way to get by this non-sense.
yea this could be a deal breaker for me, I think I will weigh my options and decide if I want to keep hanging on to this or say screw it. It bothers me because it makes no sense.
Typically the way things works is like this, calls and text go over the voice network (or on 1x), so you can be disconnected from 3G and still send and receive plain sms.
Now MMS are sent and received (downloaded) over the data network, either 1xrtt or 3G EVDO. Whether you're on wifi or not shouldn't matter as long as you're connected to the cell network.
The issue with the Epic seems to be that if you're connected to wifi it seems to disconnect from the data network (either to save battery or for some other reason INSTEAD OF KEEPING A DORMANT CONNECTION TO THE DATA NETWORK) and as such MMS can't be downloaded or fail to.
Now I don't receive a lot of MMS so I've never really been affected by this enough to annoy me but I can say that other Sprint phones I've had with wifi do receive MMS even on wifi because I assume they keep a dormant connection to the 3G network.
Either way, for heavy MMS folks who conncet to wifi a lot this must be annoying.
Just one more bug we need to alert Samsung and Sprint to for a furure fix. It might be a bug or the phone was just designed that way for some reason.
i will have to try that this is bs
if they wont do anything i may have to get an evo instead but i wish not to have to
The reason I brought this up, is because I connect wifi most of the time (at work and at home), and family sends a lot of picture messages. So this is a big issue for me especially since you don't receive any notification.
Maybe if they fix this issue then I might go back, since I am still in the 30-day return guarantee. I will be monitoring this thread.
Thanks for all for testing and confirming my problem.
Hi,
Has anybody of you who had the same problem as I did, has this issue been addressed and fixed now..
Thank you for taking the time to respond back
I just noticed that my mms pictures are now downloading when on wifi. Maybe Sprint quietly fixed this bug? Anyone else notice the change?
Sent from my SPH-D700 using XDA App
sryans2004 said:
This is a problem for me also. People have told me it has something to do with sprint/android users, which I dont see how thats the case when I have been with sprint for over 3 years now and this is the only phone that has happened to me on.
I have owned the HTC EVO, Touch Pro, Touch Diamond, and Palm Pre on Sprint's network and non had made me turn wifi off in order to recieve pictures. (HTC EVO = Android device)..
Also it seems to let me SEND pictures with wifi on just not RECIEVE.. It sucks & hope someone will figure out a way to get by this non-sense.
Click to expand...
Click to collapse
It was a problem with the hero. Its not exclusive to theepic. Apparently it has something to do with adroid
Sent from my SPH-D700 using XDA App
No problems here. Just tested on my epic, wifes Evo, and my old Hero. Everythings working fine over wifi regarding mms. I wilk say tho that the Hero and Evo received the mms withing a minute, while my Epic didnt for about 8 minutes.
Sent from my SPH-D700 using XDA App
Both before and after the ota update, my internet icon will disappear, making my phone unable too use the internet (obviously), send texts, and sometimes even not let me make our receive phone calls. Why I do not know. I am sending this message on wifi right now, because my phone has both no internet and also no radio signal. I'm at my house and my house always has full reception and I get H for the internet. If anyone can help or direct me too something I can do that would be great.
I did call tmous and they said I had the my touch internet package and switched me to general android, but this did not help my problem. Thanks
Sent from my T-Mobile G2 using XDA App
It can take up to 4 hours for any web changes to take effect. Maybe give it more time.
Also try *#*#4636#*#* - Phone information - and WCDMA preferred. Make sure wifi and wifi calling disabled because it will keep it at GSM only.
Hope this helps.
I called and did the internet switch yesterday morning. As for that stat number thing, after I pressed it everything came back on. Don't know if it was coincidence or not.
Will have to check again when out happens. What early am I looking for?
Sent from my T-Mobile G2 using XDA App
I'm having the exact same problem. In my house I can get fair hspa+ 2-4 bars, 3G who nows as we don't have a 3G notification icon. Edge when it works is 4-5 bars. My wife has the Blackberry Bold also from T-Mobile and she has a solid 3G all the time.
I already changed my device once and the new one now 2 days old has the same issues. It is really starting to annoy me as many times I get ready to use the internet and I just have a signal bars with nothing to the left and internet and email are not working. This also means my email does not sync up properly when the connection is lost.
I'm going to try and spend some time in another area and see if the problem is the same. If so I might have to give up on this device, I hate to as I really like it.
Unfortunately being in different areas does not make a difference. I love this phone as well but this is very aggravating. What causes this to happen? No other htc phone I have used or friends have used have this problem.
Sent from my T-Mobile G2 using XDA App
Steve.Beanz said:
I called and did the internet switch yesterday morning. As for that stat number thing, after I pressed it everything came back on. Don't know if it was coincidence or not.
Will have to check again when out happens. What early am I looking for?
Sent from my T-Mobile G2 using XDA App
Click to expand...
Click to collapse
Sorry I am having a hard time understanding what you are asking.
You go to the the dialpad on your phone. Enter *#*#4636#*#*
As soon as you do this it will bring up a menu. Tap on "Phone Information"
Then at the bottom you will see a dropdown box under "Set preferred network type:"
Set this to WCDMA preferred. Then hit the back button (the back arrow).
You will see that your signal has been disabled for a second, then will turn back on. Also if you can note down what it was set to before you changed it to WCDMA preferred and post that here.
Like I said this can only be done when wifi and wifi calling are disabled.
Hope I was a little more clear this time.
Well I may have to eat my words. It might be my location or just crappy T-Mobile service that is varying. I put my wifes phone in the same part of the house side by side of mine and trying to surf the web it dropped out too. Lost the 3G and got a SOS for signal bars. Unlike my G2 it recovered fairly quickly as the reception came back. My G2 has been at a loss for internet for over a hour before.
I'm still going to try some comparisons in some different ares and I hope it is just my area.
@bishybob wcdma prefered is checked.
Sent from my T-Mobile G2 using XDA App
Alright, something that's plagued a *ton* of Android phones in the past and effects this one as well is the loss of 3G connectivity after disconnecting from WiFi, disconnecting from a VPN, or coming out of an area with no cell service after having been in it for awhile. Some people say putting it into Airplane mode and taking it back out fixes it...but I've never had that work for me. Something just as simple though makes it work every time.
Go to your APN menu (Settings, Wireless, Mobile Networks, Access Point Names) and just switch to a different APN. You should be on AT&T US HSDPA right now (there are reasons it's better than wap.cingular), so switch to the top one (AT&T US - the wap.cingular one), wait until it connects (you'll see the arrows pop up on your notification bar under the H+), then just change back to AT&T US HSDPA. It'll connect perfectly and you're good to go!
It sucks that the phone *has* this problem, but since it's affected *many* Android phones in the past I'm not really surprised. Either way, hope it works for everybody.
sometimes it works sometime it doesnt ....
It doesnt work for me......
only way works for me is power off
then power on again...