Flashed to US firmware but can't activate on AT&T - Sony Xperia 5 II Questions & Answers

Hey everybody I was wondering if anyone can please help me or tell me if I am able to use my xperia 5 ii on AT&T? I had originally bought the XQ-AS52 version of the phone and I flashed it to XQ-AS62 which is the US firmware successfully and I put my sim card but nothing seems to work I get LTE+ and I have Volte but can't make it receive any calls. Is there anything I am doing wrong? Please help me thank you

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alien_x said:
I have international model, unlocked nexus s i9023. I recently shifted to India and my nexus is unable to connect to network although 3g data is working fine. I tried all radios available but nothing working even after clean install of stock rom.
Please let me know if any idea what could be wrong. Thanks in advance.
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Hi there,
I am with the same problem, but my nexus s model is 9020A and I ve moved from Brazil to UK. Using CM10 with standard configuration (kernet etc). 3g and sms are ok, but during the calls I can't listening or be heard.
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Anyone can help us?

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local_root said:
Hi fellas,
My fredin went to vietnam and i told him to by an Galaxy s3 from veitnam.so my question is that i will have any issue in using it in India?i know it could be locked...if it is locked and i do it unlocked then i can use Internet etc? any network band issue i can have? please pass your advice.
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