Share your experience!
I have bought a Xperia C4 last month and phone worked fine for two weks then suddnly keeps saying No Sim.
I have changed the Sim did not fix the issue.
Have done the software repair did not resolve the issue,in the meantime Iam stuck without a phone. Trying to call their service centerI am on hold for half an hour.
Don't know what to do in the meantime .
Hi @Farrukh21, I am sorry to hear about that. 
If a different SIM and a software repair using Xperia Companion had no affect on the behaviour you're experiencing, then you are correct in sending your device in for servicing. The best way to do so is to get in touch with your Local support in order to be assisted.