One of the most common questions we get here at iFixit is “Why are iPhone charger cords/wires so thin?” Well, there are a few reasons.
First and foremost, Apple wants to keep the iPhone as slim as possible. If the company used thicker wires, it would add unnecessary bulk to the phone.
Second, thinner wires are easier to route inside the device. This is especially important in something like the iPhone, where space is limited.
Third, thinner wires are less likely to break. This may not seem like a big deal, but when you consider that people often use their phones while they’re on the go, it makes sense that Apple would want to make them as durable as possible.
Finally, thinner wires offer better performance. They’re able to carry more current than thicker wires, which means they can charge your phone faster.