Can't get AT&T 3G? - Vibrant Q&A, Help & Troubleshooting

I managed to unlock my Vibrant, but I can't seem to get AT&T 3G on it. Do I need to change done settings to get it to work?

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Its only works where AT&T only runs its 1900 MHz band but AT&T mostly runs 850 MHz which the Samsung vibrant does not have. I think the original Samsung galaxy s has it but not us.

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nateskates said:
I managed to unlock my Vibrant, but I can't seem to get AT&T 3G on it. Do I need to change done settings to get it to work?
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Check the bands for this and the att version of the galaxy the ones that are the same are the ones that yours will work on, seems like it would have been easier to get the att galaxy s

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You can get 3g by ATT if it is there (available)
This is where you got to go to nmodify the bands and force the phone to recognize. I have used this in Hawaii so, I know it does work. You have to lock the band that is sending the 3g. The Vibrant has Quad band so you just need to know which one is the one they are using.
Okay…so do at your own risk. You can go back and set the phone to its default automatic gsm/cdma settings.
Dial: *#*#197328640#*#*
Click [1] debug screen
Click [8] phone control
Click [7] network control
Click [2] band selection
This is where you make a change, default setting is [1] automatic, which means it chooses automatically between gsm/cdma (Edge vs 3g). So we are going to change this and set it to wcdma band which is 3g.
Click [2] wcdma band
Click [1] wcdma all []
Now it should display “select wcdma all bands [*]"
Now on the bottom of your phone, click the menu key, it’s the one next to the home key, now click back, menu again one more time, back one more time, this is just to confirm it set to number 2 wcdma band.
Now click menu key one last time, click end.. and you are done. Now to double verify that the phone is locked into 3g, dial in: *#*#4636#*#*
Then click phone information Then scroll down to “set preferred network type” It should now have listed “wcdma only.” PS, if you tried to do a shortcut, and just set wcdma this way first without doing the lock above, it would just go back to gsm/cdma auto once you exit the screen.
Good luck

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iLikeAndroids said:
Its only works where AT&T only runs its 1900 MHz band but AT&T mostly runs 850 MHz which the Samsung vibrant does not have. I think the original Samsung galaxy s has it but not us.
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That is my understanding as well. The FCC reports shows AWS and 1900MHz. No 850MHz.
oka1 said:
You can get 3g by ATT if it is there (available)
This is where you got to go to nmodify the bands and force the phone to recognize. I have used this in Hawaii so, I know it does work. You have to lock the band that is sending the 3g. The Vibrant has Quad band so you just need to know which one is the one they are using.
Okay…so do at your own risk. You can go back and set the phone to its default automatic gsm/cdma settings.
Dial: *#*#197328640#*#*
Click [1] debug screen
Click [8] phone control
Click [7] network control
Click [2] band selection
This is where you make a change, default setting is [1] automatic, which means it chooses automatically between gsm/cdma (Edge vs 3g). So we are going to change this and set it to wcdma band which is 3g.
Click [2] wcdma band
Click [1] wcdma all []
Now it should display “select wcdma all bands [*]"
Now on the bottom of your phone, click the menu key, it’s the one next to the home key, now click back, menu again one more time, back one more time, this is just to confirm it set to number 2 wcdma band.
Now click menu key one last time, click end.. and you are done. Now to double verify that the phone is locked into 3g, dial in: *#*#4636#*#*
Then click phone information Then scroll down to “set preferred network type” It should now have listed “wcdma only.” PS, if you tried to do a shortcut, and just set wcdma this way first without doing the lock above, it would just go back to gsm/cdma auto once you exit the screen.
Good luck
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Pretty sure 1900MHz AT&T 3G worked automatically once I unlocked the phone.