Can I switch my sprint phone to metro pcs

probably not, but you're not completely out of luck, Ting and GoRedPocket will work on your Sprint phone.

Ask metroPCS if they will accept a carry in Sprint phone.

No, since Metro PCS does not use a sim card.

Neither does Sprint, they are both CDMA phones. Verizon and Sprint will not accept walk-in phones but some of the other CDMA carriers will. Best to ask MetroPCS.

DC,

Now that MetroPCS is a T-mobile MVNO, they do use SIM cards