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Oppo phone cannot connect 4g | AT&T Community Forums

I just found out that oppo cannot connect 4g in the USA or because of AT&T I'm not sure. I can't fix or setting my phone. If I move to another sim card would it be able to connect 4g?

Oppo Reno 4 Pro 5G

Nope.  If it's not on the list, AT&T won't allow it.  (and it won't work) The days of just checking bands and tricking sim cards are over ( at least for the forseable future) https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.att.com/ecms/dam/att/consumer/help/pdf/Service-Capabilities-Unlocked-Devices-ATT-Network.pdf&ved=2ahUKEwiX-Jv8oYLtAhXQo1kKHYhHDGcQFjAAegQIARAB&usg=AOvVaw3sCP2kJRUevj0ARWKoc1nJ

Why isn't Xiaomi listed?

Neither will Blackview, Huawei, Honor, Oppo, Sony, Ulefone, Redmi.  If it doesn't come in a North American version, with a US warranty, it won't work.