So I've gone through 2 exchanges (3 phones) with the Galaxy S6 Edge due to display defects. Two of the phones were plagued with the dreaded "Cell Standby" which had 30-60% of my battery being used by it. Now on my third phone, the cell standby doesn't even show under battery information and the battery life all together seems far superior. Same settings/apps on every phone, same daily routine, same locations. That leads me to say, is the cell standby issue a hardware issue? Based on my own experience it appears so.