Yep. I agree with Troy. That setting is tied to the carrier provisioning on the sim card. I've seen this with other devices when swapping sims. Some carriers allow you to manually switch, and others don't. ATT doesn't allow you to manually switch. Pop a TMobile sim into the same device and the options come up. Obviously, the device would need to be unlocked but unlocking by itself isn't what it's tied to.
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