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although the network bar shows full connectivity .. my SE Xperia Neo V notification bar says no service
due to which i'm not able to make/recieve calls .. plz help
PS : my phone had fallen in water so got it repaired by authorised service center .. dey changed all the parts but still i'm getting this problem ..plz help
make sure that you have choosen the perfect network mode i.e. GSM or WCDMA (GSM more prefered) .and set network mode automatically
i have choosed GSM only as i use Vodafone but still the same problem
and to tell you all .. this is surely a PHONE PROBLEM as my sim works perfect in other phones while the sims working fine in other phone show the same ERROR in my phone 
it might be a hardware issue, you should take it back to a sony repair center