Please help someone
I'm tired to this problem
Please help me
Unknown error
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Please help someone
I'm tired to this problem
Please help me
Unknown error
Try your SIM in a different device, see if it works there. If it doesn't, get a new SIM. If it does, then you may wish to consider wiping and reloading your Z10 OS, as it appears there might be some issues. If it doesn't work after that, might want to look into possible hardware issues.
Do what Blaze says, yes. If none of that works, you will probably need a new SIM tray installed. They are only a few £ or $. It is a surface mounted component so you should be able to get a phone repair shop to change this part easily.
Look on YouTube for Z10 SIM tray replacement and you will see people doing this job pretty easily with minimal dismantling and a heat gun.