For Software, can you please elaborate what is it particullary saying about problem?
For network: goto settings>connections>mobile network>network operator> and do manual or auto search. or goto settings>connections>mobile network>Access Point Name>select one with wriiten "(service operator name)Internet".
do a network reset in settings and then backup data shut down phone press vol up +power button till samsung logo appears android recovery screen will appear scroll to wipe data factory reset from there it should solve the issue if not then it's probably a hardware issueand needs to go to service center when did this problem start I mean after any update or just like that check in safe mode if this problem is there 👍
