84• Enable L2TP secret (L2TP, L2TP/IPSec PSK networks and L2TP/IPSec CRT networks)• Set L2TP secret (L2TP, L2TP/IPSec PSK networks and L2TP/IPSecCRT networks)• Set user certificate (L2TP/IPSec CRT networks only)• Set CA (Certificate Authority) certificate (L2TP/IPSec CRT networksonly)• DNS search domainsMobile networksYou can select roaming options for your i100, From the Wireless & network settings menu, touch Mobilenetworks. The following options are available:• Data enabled: When enabled, allows you to access data over aMobile network.• Data roaming: When enabled, lets you use data services on yourphone while you are roaming outside your Home network.• System select: Restricts your i100 to use within your Homenetwork (no roaming), or allows Automatic roaming.Dial Up NetworkingWith Dial Up Networking enabled, your phone’s access to allother data services [such as the Browser and MultimediaMessaging Service (MMS)] is disabled.Important!: Please contact your Wireless Carrier before using your phone asa modem through Internet Sharing or Tethering. A tetheringservice plan is required due to high data usage.Enabling Dial Up Networking1. From the Wireless & network settings menu, touch Dial UpNetworking. A Notification appears to inform you that, ifyou enable Dial Up Networking, you cannot use other dataservices. You are prompted to confirm that you want to usethis service.2. To enable Dial Up Networking, touch OK. The check boxchanges color from background to green.Note: For information on creating a Dial Up Network connection, refer to yourpersonal computer user documentation.Disabling Dial Up Networking From the Wireless & network settings menu, touch Dial UpNetworking. The check box changes color from green tobackground. You can now use other data services.