My galaxy s6 will not connect to any mobile data. Seems like there is something that is stopping the connection. Any idea on how to fix this?
Remove and then reinsert your SIM card - it may just need a connection refresh.
Check your Network settings and see if Global or LTE/CDMA is selected. Opinions vary, and it may depend on your location - I've always had better connection with LTE/CDMA. Whatever it is set to, try the other and see if there is a difference.
I know how important it is to be able to remain connected to the internet. When did this start? Have you recently downloaded any new applications?