Samsung SGH-T339RRATMB - Manual (Page 28)

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Here's How it Works
Rather than using GSM radio as your phone normally would to connect to cellular towers, your T-Mobile Wi-Fi
compatible phone uses UMA (Unlicensed Mobile Access) technology to use a wireless broadband Internet
connection for your mobile phone services. This includes voice calls, mobile browsing, e-mail, Picture Messaging,
Text Messaging, and basically any mobile service for which your phone uses a network connection.
UMA technology offers fast, reliable connectivity using your mobile phone for virtually all of your communications.
UMA connects your mobile phone to your GSM/GPRS services through WLAN (802.11) and allows you to handle
calls, send and receive messages, and check your e-mail. This technology allows you to use your mobile phone in
all of the ways you normally do. The only difference with using UMA technology is that you are connecting through a
wireless broadband Internet connection (Wi-Fi).
What is Wi-Fi?
Wi-Fi, or Wireless Fidelity, is a term that is used generically to refer to any product or service using any type of
802.11 technology. Wi-Fi networks operate in the unlicensed 2.4 GHz radio bands, operating at up to an 11 Mbps
(802.11b) or 54 Mbps (802.11g) data rate.
Wi-Fi enabled devices (laptops and PDAs as well as UMA phones) can send and receive data wirelessly from any
location equipped with Wi-Fi access. This is accomplished using wireless routers, installed within a Wi-Fi location. A
wireless router transmits an RF signal to Wi-Fi enabled devices that are within range of the router. Depending on the
particular router, its range is usually about 300 feet. The speed of the transmission is governed by the speed of the
internet connection fed into the wireless router.
What This Means to You
When you are not in range of a Wi-Fi connection, your normal cellular network takes over and keeps you connected.
Your phone switches automatically from Wi-Fi to cellular whenever it's necessary to maintain your connection,
whether your phone is in Idle mode or in the middle of an active call. The switching process is virtually unnoticeable.
Warning!: 9-1-1 Emergency Service available over Wi-Fi may be limited (it won’t work during electrical power or broadband outages).
Before using this phone to make calls over Wi-Fi, you MUST provide us with the primary street address where you will use T-
Mobile @Home service, and you must furnish us with any address changes. Refer to T-Mobile’s Terms and Conditions for
other limitations and information.