Summary
Thanks to the dock port and earphone jack built into your iPhone, you can easily add many different types of accessories, some of which enhance the capabilities of your iPhone overall, while others work seamlessly with specific apps to enhance functionality without compromising portability.
When it comes to purchasing certain types of optional accessories, such as headphones, earbuds, external speakers, or Bluetooth wireless headsets for phone conversations, investing in higher-end products will allow you to experience better audio quality from your iPhone. However, the accessories you ultimately choose are a matter of personal taste, how you typically use your iPhone, and your individual needs for the device.