If you are switching phone to Samsung Galaxy Tab, and have stored your contacts used in your previous handphone into the SIM card, you can import those contacts in your SIM card to the Contacts application of Samsung Galaxy Tab.
Here is the way to do it.
Step 1: Open the Contacts application in your Samsung Galaxy Tab by tapping the Contacts icon as shown below.
Alternatively, you can also open the Phone application and select the Contacts tab to reach the same place.
Step 2: Press the Menu key (the 1st of the 4 keys below Samsung Galaxy Tab) and select Import/Export.
Step 3: Select "Import from SIM card", then select Save contact to "Device".
Step 4: The list of contacts in the SIM card will be shown on screen. Press the Menu key again and select "Copy to device" to duplicate the contacts to the phone, or select "Move to device" to move the contacts from SIM card to the phone (after moving, original contacts will be removed from SIM card).
Note that you also have the option to delete unwanted contacts in SIM card here with the Delete option.
Step 5: You will be given the option to select the contacts you want to copy or move. If you want to select all, then just choose "Select All".
Step 6: Tap on the "Done" button below and the import will be performed.
When the action finished, you can press the Back key (the 3rd key) to return to Contacts.
Perhaps you already figured out how to export contacts from Samsung Galaxy Tab to SIM card. The process is similar, just that you select "Export to SIM card" instead of "Import from SIM card" during Step 3.