I wondered if anyone knew if I had my umtauschte card from my prepaid and put them in my new Blackberry if I had to pay my plan home in the US, as well as my phone in the other country. Perhaps the contract has expired and you want to switch to another supplier, you can go to another country or you want to pay only an early closing fee and early to get out of the contract. Even if you do not purchase the device directly from a particular carrier, but buy it from a dealer like Amazon or Best Buy, and it is for a particular carrier, it probably has a carrier lock on it. Main difference between an unlocked and locked mobile phone Locked mobile phones Locked mobile phones are not operator-specific, which means they may be able to connect to certain mobile phone lines and use the mobile service from many different operators. Other features: image viewer, audio recorder (emergency storage and SD card), alarm clock, calendar, camera (0.3M), bi-directional. Wide compatibility - This smart clock can support most Android and iOS phones. If you travel frequently abroad, it may not be sensible to be bound to a phone that does not work internationally (or one that costs you an arm and a leg abroad). With the telescope boom design, you can customize different sizes of smartphones up to 6.7 inches, including iPhone X and Samsung Note 8 !, Provides the leading stick-on joystick with the big physical manipulation that gives precise control. Even if you unlock the phone without any assistance by your network operator, you may need to use the code whenever there is an update of the software on your phone. They sell these phones with heavy grants in the hope that they can make the difference (and so any) in the two years that a customer is contracted. You can also buy an unlocked tri-band or quad-band phone; Tri-band phones work in most international countries and quad-band phones work on each frequency. Apple Iphone 5c 16 Gb White Unlocked on this page.