not registred on network gt-p5220 - Galaxy Tab 3 Q&A, Help & Troubleshooting

hi aa freind offer me a tablet gt-p5220 4g , he give it to me because sim not work
i try to fix it when i try to tape any call or eveen command as *#7455625# or any other command i got error not registred on network the only one work is *#06#
when i go to setting other setting mobile network it wont access it asks insert sim card even the sim is there so other tablet can access in mobile network without sim
i find some code to see if the tablet is locked but all code not pass (not registred on network) i google it some say to go to setting mobile network and choose manual operator but it wont access in this mobile network menu it asks insert sim card to enter network services
other thing wheni scroll top menu in the bottom wrote emergency call only
i remove sim put ti again asks reboot to reconize sim after reboot no sim icon in the buttom
any help or suggestions will be really appreciated
big thanx in advance

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