Select Menu > Settings and Connectivity > Network.
Your device can automatically switch between GSM and UMTS networks. GSM networks are indicated with . UMTS networks are indicated with .
Select from the following:
Network mode - Select which network to use. If you select Dual mode, the device uses the GSM or UMTS network automatically, according to the network parameters and the roaming agreements between the wireless service providers. For details and roaming costs, contact your network service provider. This option is shown only if supported by the wireless service provider.A roaming agreement is an agreement between two or more service providers to enable the users of one service provider to use the services of other service providers.
Operator selection - Select Automatic to set the device to search for and select one of the available networks, or Manual to manually select the network from a list. If the connection to the manually selected network is lost, the device sounds an error tone and asks you to reselect a network. The selected network must have a roaming agreement with your home network.
Cell info display - Set the device to indicate when it is used in a cellular network based on microcellular network (MCN) technology and to activate cell info reception.