Congratulations on your new car! I've got the Volvo On Call (VOC for short) and it's super useful. For example you can check you car's status (locks, fuel, consumption etc), lock or unlock the car, activate heating and more. For example, sometimes I have a feeling I haven't locked my car, that's when the on call app comes in handy - puts your mind at ease. It also helps you warm up the car, if your car is equipped with the fuel driven heater. Really convenient. I also love the feature that keeps track of your trips. You can easily send a log of your trips from the last 40 days to email.
Definitely try out all the features. You could also try downloading the manual app for your smart device. That's an other useful way to get to known your car and it's various features. I love the VOC, but don't have the satnav, so no comments on that.