Why does my Lumia 520 say no service after Denim update?

[Windows Central Question]

my lumia 520 says no service after denim update

after updating from wp8 to 8.1 my network service is missing ihave used different sim cards as well as different service providers but theissue persists plz help

 

[Kunalya]

Re: my lumia 520 says no service after denim update

I am also facing issues after denim update , about my network. Some time its showing no service

 

[djeire84]

Re: my lumia 520 says no service after denim update

Go to settings, mobile and sim, sim settings and make sure network selection isn't set to manual but to automatic.