The only reason I traded in my iPhone 6 for a 7 was that I actually ran out of memory. And I got a screamin’ Black Friday deal. But now my iPhone 7 has plenty of memory and I see absolutely no need to upgrade.
I was running into that problem on my iPhone 5s, until I upgraded iCloud and allowed pictures and stuff to go to the cloud. Costs 99 cents a month for 50GB of storage, good deal. No more memory problems with the iPhone after that.