Samsung SGH-T999ZAATMB - Manual (Page 38)

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Wi-Fi Calling: Wi-Fi connection required; may decrement plan
minutes. See your selected service for details.
Devices, accessories, and screen images are simulated. See
brochures and
Terms and Conditions (including arbitration
provision) at T-Mobile.com, for rate plan information, charges
for features and services, and restrictions and details,
including
important limitations on availability and reliability of 9-1-1
emergency service when using Wi-Fi calling.