1. You flash the modemfly.zip file which was ported earlier in one of my reply.
This is the modem.img of your phone model. Which normally get erased or currupt when we flash non stock roms. I am porting it again to ease you. or it may be available in your external SD Card. Do a CWM flashing.
2. Kindly check using phone call #*06#, if it is invalid no signal will come.
I understand after the last exercise only you were able to get back the signal bar notation on the lock screen and also you were able to write the imei.
Have you tried flashing imei.zip file earlier ported using Mobileuncle tool. .
try and report. until tomorrow I evening I will be in Chennai and then I will be moving out to my village and if signal comes I will attend.
Now the problem in your phone is only modem.img you try to download roms from same model phones and replace the modem.img in my file that is modemfly.zip and continue the excercise, you will succeed. or you port the url of roms pertaining to your phones, I shall try to port you few zip files that you can attempt if file in fails.
I hope you will succeed. I am porting agian the modemfly.zip file again,
Wih best of luck.