Iphone 4s blank IMEI – Please help

Hello all,

I just purchased Iphone 4s from Ebay and after using it for month the IMEI is blank now, Is there any solution to fix it ?

I gave it to local repair shop but he said it is not possible to fix this solution.

I don’t know what to do now 🙁

Please let me know if any solution is there.

Thank you in advance.