Of the many things your phone can do, automatically recording a phone call is not one of them. Perhaps not including that feature is a security precaution for phone makers; it could be a potential liability issue. Regardless, from time to time, documenting a call is a useful thing to do, whether you’re conducting a phone interview or cataloging a customer service call.
In 2017, there are so many things we can use out iPhones for. Some of us use them for shamelessly taking 100s of selfies, some might use it as a tool to navigate and tons of other simply use it as a way to surf the internet. Whatever you use it for, there is no arguing that iPhones are amazing devices that can do a lot.

New voicemail & password setup. Make sure to set up your voicemail within 60 days of activation or it’ll be automatically removed from your account. From your wireless phone, press and hold 1 or the Voicemail key. Select your language preference. Create a 7 to 15-digit password. Select your preferred greeting.
Whether you can record your own greeting (also known as “voicemail outgoing message”) depends on your carrier and whether they have their own mechanism in place, or integrate neatly with the iPhone’s native functionality.