I might try exchanging it for warranty. Hard to tell because I got the GPS one not the LTE (i see no use for that), and it's known that poor signal could overheat and drain your battery. That happens even on phones
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Notification Led is out of Samsung phones since a long time ago. Is matter of spacing on the phone since now we have this massive screen that occupies 90% of the front of the device.
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Yes. As far as I know the carrier and version that you have matters. I don't have the exact information for the Note 10 but for the Note 20 the device has to be the unlocked us version and/or be on T-Mobile.
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