IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
You are in luck because of the 7.1 update, which will work better for you than iOS 7. As GorgeRang pointed out, iOS 7 didn’t seem to play that well with the iPhone 4. If you want to experience apps crashing on a slow iPhone, try iOS7 on an iPhone 4. With iOS 7.1, an iPhone 4 should run smoother, load apps a little more quickly, and experience fewer hangs/crashes. It’s an improvement. It is also probably the final version of iOS that iPhone 4 users will get. I would not expect to see iOS 8 on an iPhone 4.