Voice call barringSelect the desired barring option, and set it on (Activate)or off (Deactivate), or check whether the option is active(Check status). Call barring affects all calls, including datacalls.Internet call barringTo select whether anonymous calls are allowed from theinternet, set Anonymous call barring on or off.Network settingsYour device can automatically switch between the GSMand UMTS networks. The GSM network is indicated within the standby mode. The UMTS network is indicatedwith .Select Menu > Tools > Settings and Phone > Networkand from the following:Network mode — Select which network to use. If youselect Dual mode, the device uses the GSM or UMTSnetwork automatically, according to the networkparameters and the roaming agreements between thewireless service providers. For details and roaming costs,contact your network service provider. This option isshown only if supported by the wireless service provider.A roaming agreement is an agreement between two ormore service providers to enable the users of one serviceprovider to use the services of other service providers.Operator selection — Select Automatic to set the deviceto search for and select one of the available networks, orManual to manually select the network from a list. If theconnection to the manually selected network is lost, thedevice sounds an error tone and asks you to reselect anetwork. The selected network must have a roamingagreement with your home cellular network.Cell info display — Set the device to indicate when it isused in a cellular network based on microcellular network(MCN) technology and to activate cell info reception.Connection settingsIn connection settings, you can edit access points andother connectivity settings.Data connections and access pointsYour device supports packet data connections (networkservice), such as GPRS in the GSM network. When you useyour device in GSM and UMTS networks, multiple dataconnections can be active at the same time, and accesspoints can share a data connection. In the UMTS network,data connections remain active during voice calls.You can also use a WLAN data connection. Only oneconnection in one wireless LAN can be active at a time, butseveral applications can use the same internet accesspoint.To establish a data connection, an access point is required.You can define different kinds of access points, such as thefollowing:• MMS access point to send and receive multimediamessages 137 Settings