iP3GS w iOS 5.1.1--restoring backup to iP4S w iOS 6
I have an iphone 3GS with iOS 5.1.1 on it (cannot update it to iOS 6 bc it doesn't have 2.1 GB avail.) & will be restoring from backup to an iphone 4S that has been wiped clean and I believe has iOS 6 (or does it? how can i tell if i can't activate it yet since MicroSIM from AT&T hasn't came yet?) anyway, will there be any significant "issues" if I restore a backup that is from 3GS and has iOS 5.1.1? Thanks.
iPhone 3GS, iOS 5.1.1, Phone 4S; iOS 6; restore frm backup