T-Mobile 535 - Manual (Page 12)

T-Mobile Communication Centre application can be used for easy
connection setup and Internet access also through a high-speed
wireless technology (WLAN). If your notebook support WLAN or if
you have a WLAN card inserted, the connection to the Internet is
very easy.
If a recognized WLAN card is available in your computer and the
application TMCC recognized that T-Mobile HotSpot service is
available, the TMCC window is extended by a top part.
The customer can enter his/her name and password obtained within
the framework of the T-Mobile HotSpot service and log into the
network by clicking on Login. Name and password are stored for
future use.
You can log off the T-Mobile HotSpot service by clicking the Log off
button.
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7. WLAN Settings