Unlocked Xperia Z3 Compact on AT&T?

[RoscoV3]

I would like to know if the unlocked version will be compatible with AT&T.  I know it is on T-Mobile and that their networks are sort of compatible but I want to make sure I'm not going to be buying something that isn't 100% functional on the AT&T network. 

Thanks all

[bkz81]

I have a quesiton about the sim cards.  Doesn't the Z3 compact have a Nano sim instead of a mirco sim?  I currently have a S3 on AT&T.   http://www.gsmarena.com/compare.php3?idPhone1=6538&idPhone2=4803    just wanted to make sure. 

[brokenman]

The Z3 compact does take a nano-sim.  You will have to go to an AT&T store to get one.  This is painless - tell them you have a new unlocked phone that needs a new sim.  It took me 5 minutes, zero cost.

[brokenman]

I can confirm JohnD's comment that the unlocked Z3 compact model D5803 works great on AT&T.  I ordered mine from Amazon, they have an US-based supplier now and it is available with free 2-day shipping through Amazon Prime.

I had to go to the AT&T store to get a new nano sim and also had to change my plan from smartphone (unlimited data) to LTE (unlimited data).  It was a painless experience and the lady at the store was very accommodating (and pretty hot).  I think you can order one for free if you call AT&T but I have a store nearby and didn't want to wait.

The only problem I encountered was that I could not connect for mobile data until I added the correct APN.  Following is the information on that if anyone needs it:

Settings - Wireless & Networks - More - Mobile Networs - Access Point Names - hit the + sign at the top to add.  I added the following settings...

Name -  att Phone

APN - phone

Proxy - not set

Port - not set

Username - not set

assword - not set

Server - not set

MMSC - http://mmsc.mobile.att.net

MMS proxy - proxy.mobile.att.net

MMS port - 80

MCC - 310

MNC - 410

Authentication type - none (different than not set)

APN type - default,mms,supl,hipri,fota (no spaces)

APN protocol - IPv4

APN roaming protocol - IPv4

APN enable/disable - check box, it should says enabled

Bearer - unspecified

MVNO type - none

Regards...BM

[Emppeng]

Brokenman,

Have you been able to get LTE with those APN settings? The best I get is H+ and that's after attempting several different APN's with ATT tech support. It seems I'm not along in this problem and in the link below someone talks about using his iPhone5 IMEI on his ATT nanoSIM to be able to get LTE.

http://forums.androidcentral.com/sony-xperia-z3-compact/444558-new-z3-compact-working-great-att-lte-...

[RoscoV3]

Have you tried this? 

http://forums.androidcentral.com/sony-xperia-z3/442846-got-my-xperia-z3-4.html#post3937739

[brokenman]

Yes - I'm getting LTE with those settings.

[Emppeng]

So strange. I'm using those exact APN settings you have above and yet still no LTE.  Something must be different (since we own the same model phone), I just wish I knew what?

Also RoscoV3, tried the "Internet Settings: Download" option and that again only provided H+ connectivity.

[brokenman]

There is a lot of discussion on the XDA Z3c forum http://forum.xda-developers.com/z3-compact/help about APN settings, etc.  I notice that many people are buying European versions of the D5803 that are showing H+ (and maybe just H) but are measuring LTE speeds.  There is a post http://forum.xda-developers.com/showpost.php?p=55796221&postcount=28 that mentions flashing a US FTF firmware to get the LTE icon.  I can't say it that will work sinec I have the LTE icon.

There are 2 apps I use to check connections and speeds: rootmetrics coverage map and advanced signal status, both from the play store.  I dont understand all the information but from ul/dl speeds I can tell it is LTE and the coverage map shows an LTE connection (I think).  On the signal status, make sure you are checking your cell signal speeds and not your wi-fi speeds. 

[JohnD1]

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@brokenman wrote:

There is a lot of discussion on the XDA Z3c forum http://forum.xda-developers.com/z3-compact/help about APN settings, etc.  I notice that many people are buying European versions of the D5803 that are showing H+ (and maybe just H) but are measuring LTE speeds.  There is a post http://forum.xda-developers.com/showpost.php?p=55796221&postcount=28 that mentions flashing a US FTF firmware to get the LTE icon.  I can't say it that will work sinec I have the LTE icon..... 

---

Sorry for the delayed reply to this thread but I've been traveling all week...

Anyway - brokenman is "right on" in his reply.  In fact, my Z3C was imported from HK - and it showed the LTE icon since Day 1 - with the "downloaded" APN settings from the "Settings" menu.  Those who have purchased from Clove and others in the UK do not have the LTE icon - but the "H+", which again - offer LTE speed (although the icon does NOT show LTE)..

As well - I flashed the "US" version from the XDA site to see if it had any difference on performance. I will tell you, in my experience - there is none (I haven't tried it with my T-Mobile nano-sim, however - only AT&T). My feeling is that the "US" version of the formware (XXX.93) is simply an Asian FTF file renamed to "US" to show the LTE icon..

Hope this helps,

- John

[lettucefish]

Did this work out of the box or did you have to do something to get it to work on ATT?