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The i856 is an iDEN phone. iDen runson BOOST Mobile/Nextel ONLY. It cannot run on t-mobile, which is a GSM system. It is not possible, even if you unlock the phone, they are completely different radios and networks.
i560 is an iden phone not gsm. even if you get subsidy lock and unlock phone it will not work with att, t-mobile or any other gsm service. although both companies use sim cards, they use different systems.
If this phone was originally a Boost phone, it is more then likley on the IDEN network, which is exclusive to Nextel/Boost. Once the new SIM from the company other then Nextel/Boost is put in the phone, it will ask for a special code- thus rendering the phone useless on the new network. IDEN is only used by Nextel/Boost and another company out of the South called southernlinc.