I think what you mean is that you want o unlock it. This a CDMA phone, but there is also an S2 Sprint model which have a min-SIM card (the Samsung SPH-D710). But then again I'm not sure that it can be unlock. One way would be to contact Sprint, they will ask you for an ESN (located under the battery). To flash any firmware you need the firmware and Odin, this is a tool to flash firmware to Samsung devices. But that won't unlock your device.
I recommend that if possible, visit a Metro PCS store or Kiosk, maybe they can sell you a mini-SIM card and unlock it for you. Metro PCS use CDMA technology as Sprint and Verizon, but Metro PCS is now accepting GSM phones. Best of luck.
SOURCE: Need to reset samsung galaxy s2 phone. Can't
If you want to try a simple solution, Go to Settings, Wireless and Networks, then Turn on "Airplane Mode" wait until you see an airplane on the top status bar of your phone... then Turn OFF "Airplane mode"
If that doesn't work, and you want to reset your phone, take it to the place you bought it or any place that is on your carrier.
SOURCE: My Samsung galaxy s2 is just dead it doesn't even charge hw do I get it wrk
HI DEAR
IF YOUR S2 IS DEAD THEN IT MAY BE DUE TO 2 CONDITIONS
SOFTWARE: IF YOU WERE TRYING TO FLASH IT WITH CUSTOM ROMS OR IF YOU WERE UPDATING THE FIRMWARE AND THE THE PHONE DRAINED THE BATTERY IN BETWEEN THEN PROBABLY YOUR PHONE BOOT AREA HAS BEEN DAMAGED.IN THIS CASE IT CAN BE REPAIRED BY A PROCESS CALLED RESSURECTION.IT REQUIRES PROFESSIONAL TOOLS LIKE GPG JTAG,RIFF BOX,MEDUSA,ORT JTAG ETC PLUS PROFESIONAL SOLDERING SKILLS.FOR INFO GOOGLE IT WITH ONE OF TOOLS NAME
2)HARDWARE:IN THIS SITUATION YOUR MOBILES PCB HAVE FAULTS LIKE SHORTING,WATER LOGED,DAMAGED CHIPS ETC.IN THIS CASE YOU CAN VISIT HARDWARE REPAIR PERSON/SERVICE CENTER
SOURCE: How to restore data from Samsung galaxy s2 when
The broken screen would not due to your data loss, just try the way below to recover Samsung galaxy
http://www.any-data-recovery.com/topics/mobile-devices/recover-samsung-galaxy.html
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