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I have a Galaxy S3 running CyanogenMod 13 and I had always assumed it was locked or something because I could never get any service in the UK. When I went abroad I noticed I could get roaming service.

I came across this video which seems to describe my problem and a solution to it. I notice though that the baseband firmware download they suggest (I9300XXUGMK6) is an Irish one according to Sammobile.com. I9300XXUGMK6 is actually the baseband version my phone reports now. Is the problem maybe that I am running and Irish baseband version in the UK or does it not work like that?

EDIT: So I found out that I9300XXUGMK6 is called PDA and describes the device I have and there are a few different versions available for that device. The most logical baseband firmware for me then would be the I9300XXUGMK6_I9300O2UGNA1_O2U.zip since I am on GiffGaff which uses the O2 network. But I can't actually find this for download anywhere though.

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    sammobile.com/firmwares/galaxy-s-/GT-I9300/O2U/download/… It says the file has been archived due to few downloads, and there's a link to a contact form to request the file. Or you could try sammobile.com/firmwares/galaxy-s-/GT-I9300/O2U/download/…, which is newer. – Duane Dibbley May 4 '17 at 22:26
  • Thanks yeah, I will try the request but am not too hopeful. Any ideas what the difference in the PDA (UGMK6 to UGNA5) signifies? Is my device compatible with the newer version? – kasbah May 4 '17 at 22:39
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    I honestly don't know the difference between the two, but I've never had any troubles installing and running a newer version of the firmware as long as it's for the same hardware (GT-I9300 in your case). – Duane Dibbley May 4 '17 at 23:12

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