No, that doesn't mean you can use it with any carrier. It will never work with Sprint or Verizon because they are CDMA carriers and your phone only has a GSM radio chip. You have to unlock it if you want to use it with T-Mobile. A software unlock is not available for 5.0. You can use a GEVEY SIM unlock if you're still on 4.x and using a 3GS or an iPhone 4.