Iphone 6 no service

[WeLoveApple]

In initial state phone was only searching for service.
Then I changed U_DSM_RF. Now it stop searching after a while and then it just stops with no service.
Any ideas what should I do next?

 

[jessa]

What made you change U_DSM_RF?

 

[dukefawks]

Did you check for a bad ESN/IMEI before you opened it up?