I was in Jamaica back in October via cruise ship. I have Sprint/Nextel. They told me that I could send/receive phone calls if I had correct phone. I purchased correct phone for GSM frequencies. (850,900,1800,1900)Never did work. I am wondering if Digicel has contract with Sprint? Will simply replacing sim card with Digicel sim work? Does phone need to be unlocked? I loved that beach so much I am flying in to CSA!