From the Home screen, tap the Contacts icon to open your contact list.
Tap the Groups tab , then tap the Menu key > New group.
Enter a name for the new group.
Tap Add members to add contact entries to your new group.
Tap the Group ringtone field to set a ringtone when any of the group members call your phone.
Tap the Account field to change the account(s) you want to save the new group to.
Tap Save to save the group.
If you delete a group, the contacts assigned to that group won't be lost. They will remain in your contacts.