This looks to be a country specific issue and affecting phones from India.
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Yes bro same problem...faced this today after updating the July update.....not detecting the network...infact the sim manager option only not opening....I contacted the Samsung service call center today...they told a few members of note 8 experienced the same this....they told it's a bug in a update from their side....they told to visit nearby service center they will help u with this....
After update mobile network is showing blank
No menu option to select mobile network also
Tried power off and restart, SIM reinserting, reset of network settings - nothing seems to work
- same problem