How many years should an iPhone theoretically last? What are major points of failure? I had a flip phone for about 4 years prior to buying an iPhone 5. The flip phone began to have issues with its charging port, and the external LCD occasionally displayed weird bright lines. Also, the mute switch began to get fairly loose. Oddly, the LiPo battery seemed to hold its capacity well. I'll be happy if I can get my iPhone to last as long, but reading all the articles here may temp me to upgrade before then!