I did via this site and it said can not predict now, lol
A 4SAs others have said, it would be "fine," but, if you can afford it, the 6(S) would be better.
Out of curiosity, what's your current device that you'd be upgrading from?
Just my .02: if you're currently getting by with a 4(S), then you'll be fine with a 6, but if you've got the funds, get the (S).A 4S
A 4S