Signal not detecting

I am facing problem with signal strength in Lumia 800. I am using vodafone and some of my colleagues are aslo using the same network they are are having full signal but my phone  is not detecting the signal and displaying NO SERVICE
Please suggest me to overcome this problem.  thanks..

Can you try SIMs of your colleagues in your device ? Was your SIM cut to Micro SIM from a regular SIM ? If so, it may not have been cut properly and need a replacement ...

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