i AM CHANGING FROM SIM TO MICROSIM AND WISH TO BACK UP MY OLD ONE BEFORE TRANSFER.
depending on your device you may be able to backup your contacts via Google, Samsung Kies, iTunes e.t.c.
Or in the settings on your phone "copy contacts to phone memory". That way they are backed up on your phone.
When your new SIM arrives, if it's one of the 3in1 multi SIM type. Pop out the Mini size first so that you can insert it into your phone then "copy contacts to SIM".
Then remove it and push out the Micro size
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