Help! Sim card not detected - Galaxy Tab 2 Q&A, Help & Troubleshooting

Hello,
I bought this samsung galaxy 2 p3100 model after beggin my father so much. But two day ago it suddenly stopped recognising my sim card. I didnt do any rooting or what so ever. But I installed an anti theft software. Im not sure whether this is the cause. I tried using different sims, but result is the same. (I did the factory restore as well)
If my father finds this out he is gonna kill me...:crying:
And the nearest repair center is 240 km away and it takes nearly 7 hours to get there.
IMEI number is displayed but MDN and ERI version numbers are not displayed on the tab. It says "UNKNOWN"...
Please help me.... :crying::crying::crying::crying::crying::crying::crying:

hi. does the SIM card work in another tablet or phone?
do you have warranty and invoice for the tablet?

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Sir, Good Morning, i have tried your threads, but could not suceed to my fate. please could you help me to resolve the problem of IMEI. my mobiles Samsung Galazy S2 gt-i9100 original imei is 357470044720179, but it is showing 004999010640000. here the mobile repair shopers told that there is no hardware problem in the set. since, i was given the gift of that mobile from my demised grandmother, (which was purchased at Singapore) i could not loose it. her the samsung technicians also told that as it was purchased out of india, we can't do anything. further, the warranty is also expired. please help me..
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How do i unblock my Samsung s7580 after it was being blocked in Turkey?

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if I rooted GS3, will that solve PUK2 code need?

I have Samsung Galaxy S3 from AT&T and it's 4 yrs old and already unlocked from AT&T.
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So I got H2O Sim card and $10 for 3 months prepaid and put in the phone and activate. All are running good.
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