Will the iPhone 5s run Spotify without lag
RRight now I'm using an iPhone 4 with iOS 7 and it lags on Spotify and I wanted to know if the iPhone 5s will be fine running Spotify because I'm not paying 600 pounds for a brand new iPhone, also is the battery life good on it and would it be better to wait until I can find the iPhone 6 for 220 pounds on eBay or should I spend 200 pounds for the 32gb iPhone 5s