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International Version Compatibility with AT&T

I am considering a purchase of the international version.

Before doing so, I wanted to verify with you guys that it will work on AT&T's 3G networks. For example, the bands listed in the Amazon listing are: HSDPA 850/900/1700/1900/2100 and GSM 850/900/1800.
 
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Before doing so, I wanted to verify with you guys that it will work on AT&T's 3G networks. For example, the bands listed in the Amazon listing are: HSDPA 850/900/1700/1900/2100 and GSM 850/900/1800.

I too am extremely interested in making sure that the international version will work on AT&T (and potentially vice-versa), but don't know a whole lot about which bands are correct. Wasn't there like four versions of the Gnex that went through the FCC a month or so ago? If true that tells me that there will be carrier specific versions here (like previous Nexii releases, NOT pentaband), and that there could potentially be two quad-band international versions (instead of 1 pentaband). All of the radio/connectivity specs on websites are, to my knowledge, presumed based from Google's announcement and previous Nexii- do we have any kind of hard confirmation on supported bands from Samsung or a system dump or anything?
I am worried there will be two international versions and just in case I will post back the bands AT&T is registered to be using, and which international carriers match those. It might have to be later today though...

1) I find it troubling that 1800 isn't listed as a band under HSDPA. Am I just misunderstanding the way this works? Also, as I understand it, the way AT&T gets up to 14 MB and 21 MB for HSPA is by using two bands on the radio (850/1900) -- I presume this is possible with the international version?

I am not 100% certain that AT&T is using the 1800 band presently (isn't it part of their LTE growth plan?). I don't know a whole lot about which bands are being used for which connections, but I am fairly certain that the important thing is that the phone's radio can recognize and process the bandwidth- whatever the connection speed. That is probably wrong, but I can't see how anything but drivers/software would be limiting the speed coming in on that frequency.

2) How does this work with the Android Market? Will I get the USA version because I'd be using a USA SIM card?

The Android Market does not recognize the ISP, the market version is determined by the "fingerprint" (device ID) coded into the system build. This is editable and changeable after the fact (search "international android market fix" over at XDA-Developers in their Galaxy S forum for details on it) and with Root permissions.

3) I have a micro SIM card because I have an iPhone 4. Can I just use a micro SIM adapter and plug it in to the regular sized SIM slot??

I believe so, but am in no way an authority on this. Just go to your AT&T store and ask for a new regular SIM, I've never had trouble or even questions about getting a new one.
 
Just as a follow up:

AT&T uses 850/1900 GSM 2G and 3G services, and will be using 700 for LTE.

In the UK (where we would likely be buying these from)

VodaFone & O2 use 900/1800 for 2G and 2100 for 3G (HSPA?)
Orange & T-mo use 1800 only for 2G and 2100 for 3G (HSPA?)
3 only had a listing for using 2100 for 3G (HSPA?)

so no direct matches to say "make sure you buy a _______ Galaxy Nexus." I suppose we will just have to pay attention to the bands listed in the specs when released, and make sure it has 850/1900 support (and wishfully 700 support, oh we can dream can't we...). I really hope it is pentaband- one unit is much less worrisome...
 
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