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Use unlock code to remove the lock from your Sim in Samsung SGH-U600. Contact your service provider to get the code. If they failed to provide the code get it from the site Theunlockarena.com ,and unlock it using unlocking instructions which is given in the site itself.
You can only get the details which you require from your network service provider. Also, to access data services on your phone you must subscribe to a BlackBerry data plan: not all service providers can offer you this.
You need to get the phone unlocked. Either call tmobile and request an unlock code or buy one online. This code will free your phone from the Tmobile lock and you'll be able to use it on any GSM sim card.
You can only change the band if your provider offers service on that band. So if you have bad reception on your current band try switching provider.. which offers their service on other / multiple bands.