My iPhone is newly bought this month but it's an old model so it comes with iOS 14.1. I haven't updated it but I found that many apps hang up quite often, not exaggerating, at least once every 10 minutes of continuous use. Is it because I haven't updated to latest iOS? Or is it because of any other underlying reason? e.g apps alone? However, I only install apps from reputed developers e.g. ig, whatsapp