Very similar phone, Samsung Galaxy J3 Star, model no. SM-J337
I bought it used, unlocked from T-Mobile, phone/data service from AT&T.
I was brutally slammed by an online update from "T-Mobile" and a number of other "issues" although my service is not with them, and the phone is supposed to be unlocked.
T-Mobile's apps and branding cannot be removed from the phone, and certain features remain permanently crippled.
No IPv6 support. The device is apparently limited to IPv4 only, or else it's some other issue with AT&T service. I don't know.
No Bluetooth tethering, and no file transfer via Bluetooth; Bluetooth functionality remainss crippled and limited to voice call and streaming media only.
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