Hey guys, A quick question for you. My mom broke her 4S and is getting a new one from her friend which apparently has 5.1.1. She said she won't upgrade to iOS 7 because her current 4S (which broke) was a little sluggish, but she loved the UI and the features. She uses apps like WhatsApp and Viber for work and I've heard that Apple allows for older versions, so is that possible? Can she pull off 5.1.1 on her future 4S? She said she doesn't mind 7.1.1 if she has to but would prefer 5.1.1 Thanks.