Samsung Galaxy Note 4 T-Mobile Manual page 32

Additional Information
There is no additional charge to receive WEA alerts. Alerts may not
be available: (1) while on active calls; (2) if a subscriber is outside
the T-Mobile coverage area; or (3) due to interference concerns.
You cannot forward or reply to WEA alerts. Currently, WEA alerts will
only be in English (no other languages available). Occasionally, a
duplicate of a previously received alert may display again. For more
information and FAQs see www.t-mobile.com/CMAS.
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From the Home screen, tap
g Emergency alerts.
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