I am looking into getting the Note 3 on T-mobile to use with my service with Metro PCS. I am aware that it has to be unlocked, but am I suppose to look for anything else before I purchase a phone online (ex. Amazon or Ebay) to ensure I will be able to use it and not have to hassel with returning it. I want to be able to insert my sim card with Metro PCS into the phone and all works like normal. This phone is too expensive to pay up front and it not work.