br Apple has used the lightning connector for seven years.br It used to be on everything, but now it's only found on two types of devices — iPhones and some iPad models.br The lightning cable Apple includes with the iPhone doesn't support fast charging and transfers data at USB 2.0 speeds.br Switching the iPhone to USB-C could unify Apple's products.br 1. It's proprietary - so fewer devices can use it.br 2. It's more expensive.br 3. It's slower.br 4. It doesn't support fast-charging.