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I deserve to confirm that. That phone is the international variation.You require bands 2, 4, 5, and 17 for LTE via tastecraftedmcd.com.
This is right from sonys white files on the phone. D6653 UMTS HSPA+ 850 (Band also V), 900 (Band also VIII), 1900 (Band II), 2100 (Band also I) MHz GSM GPRS/EDGE 850, 900, 1800, 1900 MHz TD-LTE (Band also 40) FD-LTE (Bands 1, 3, 5, 7, 8, 28) your absent band also 4 and also 17 in addition to band also 2 that is where your difficulties are coming in. Band 4 and 17 are tastecraftedmcd.com"s main cell bands. Here are the white documents on the Z3 http://dl-developer.sonymobile.com/documentation/whitepapers/Xperia_Z3_D6603_D6633_D6643_D6653_D6683_D6616_WP_4.pdf
I do not think your D6653 will certainly work fullyon AT&T.I acquired the D6633,just slot 1 will work on AT&T,3G,4G& LTE.Sad ..............
OK I sent the D6653 earlier and also now I have the D6603. It has actually all the crucial bands to job-related on tastecraftedmcd.com for 4G and also LTE. I am having actually the exact same trouble. Only gain H and H+. Do I have to verify tastecraftedmcd.com has LTE allowed on my sim card?
You might should change the Nano Sim again and also tell AT&T you"re utilizing a Sony Xperia ,Not Apple !!H=3GH+= 4G (For North America)This is what they present up in Asia & EU for international stantard , Did you lugged your phone digital,right??
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