I can't Access my internet after update lumia denim from cyan?

[Windows Central Question]

Hey guys please help me out. i am using Lumia 520. and i have update it from cyan to denim last night. but now i am facing a big problem that i can't access my mobile data internet from my phone so please guys tell me how do i fixed it????

 

[sufran]

Switch it off and then on it again OR do a soft reset.