weaker signal - AT&T, Rogers, Bell, Telus Samsung Galaxy S III

after flashing a couple roms, i went back to stock. i noticed that i now have a weaker signal than before that i am out of service where i had full bars and service months ago.
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flash the newest modem for your phone
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sorry I'm new. how so i do so?
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http://forum.xda-developers.com/showthread.php?t=1831898
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Related

Question. Updating Roaming And Root

Does updating roaming mess up anything as far as root goes
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No
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No GPS in Puerto Rico?

I'm confused as to why I can't get my GPS to work over here. It was fine in NYC and I have full bars of T-Mobile, but GPS cannot find me?
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Have you tried the faster fix app?
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No, is this something I can get from tge Play Store? I'll look into that now
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Is it giving you any kind of location?
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Now Lte in Long Island New York

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http://forum.xda-developers.com/showthread.php?t=2197488
Still no in 11757
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This isn't a question and use lte thread in general
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S3 leak 4.2.2

http://www.sammobile.com/2013/06/21...re-for-the-galaxy-s-iii/#.UcSZIFqRXlM.twitter
Hop we are next
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I know....
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Didn't this happen a month ago? Or is this a newer version of the firmware?
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Next month is our
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See
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Installing a custom rom and now I lost my 3g and 4g just have edge only need help

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Same thing happened to me. I even flashed back to stock rom and had the same issue. I ended up having to get it replaced by ATT.
http://forum.xda-developers.com/showthread.php?p=43328475
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petco1506 said:
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Click to expand...
Click to collapse
Try above but also make a backup of eds folder to avoid losing imei
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How can I do it for art i747 version
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