I got an sms that there is some fire in switch which controls 2G network of mtnl in BKC Bandra and there will be no 2G network in western suburb of Mumbai. They said that switch to 3G network if you have such handset or wait till it is rectified.
Strange thing is when I search networks. It shows MTNL with right tick next to it.Which means, Mobile is able to detect network and also register itself.But mobile shows "no signal" and cant make/receive calls.
Are you trying on different mobiles ? Their network has become so buggy lately, which is tragic given the fact that their coverage has been pretty awesome for me.Chembur. Confirmed working at other places too.