Answers: What phone is it and what memory card do you wanna use in it??
On the bottom of the E900 within is a little plastic flap next to micro SD written on it. Pull the flap up slightly with your fingernail and verbs it. This exposes the hole for the card. Insert the card (if i remember correctly the chip should be facing forward) it'll only stir in one track. A message will flash up on the phones screen adage the memory card is inserted. Job done....... If you need more sustain then e-mail me..