Yup, you read that title right. The reason is that I'm looking for a new iPhone for my mum. She currently has my old iPhone 3G (I'm still rocking my 4S for another year), but her eyes are going downhill and I think a retina display would really help her out. Alas my 4S is a bit beat up and I've used the battery on it way more than I did my 3G, so I don't want to give it to her and would rather buy new instead. So, what phone to get? I already know she doesn't like the 5C colours (neither do I tbh), so we're left with the 4S or the 5S. She doesn't use apps or Safari right now (with a better phone she might use simple ones like for the weather or public transport), or listen to music really, so I think the £549 16GB 5S is way overkill for her needs (I fear she'd also tell me to turn around and take it back and never spend that much on her again!). On the other hand, the 4S 8GB at £349 isn't the greatest value when compared with other models. Still, thought I'd get the opinion of the community. Is there any compelling reason for a light iPhone user to upgrade to a 5S rather than a 4S for a phone that will hopefully see 3, maybe 4 years of use? (bear in mind the battery will go downhill through use regardless so it's not even like the 5S could be kept for a lot longer than the 4S I think). Note: These are unlocked phones, her SIM-only contract amounts to £10 a month, so the contract is entirely irrelevant; there's no subsidy or anything like that which would make the better phone worthwhile on a cost basis.