What kind of phone? Devices can pair as either a phone or an entertainment device or both. When you pair a typical phone, it usually does both types of pairing at the same time.
You can tell from the pairing listed when you go to system set up and pairing menu. It should list all the devices that you have paired, including your phone. There are two icons on the left of the device name, one looks like a phone the other music. You will only be able to connect to the phone for playing media if the entertainment icon is shown (may have an red X through it because its not connected).
You may have to set up your phone to stream over bluetooth, delete the current pairing from the radio and pair again. If the phone gets paired as an entertainment device, it will show up in the aux menu as a device to select, otherwise it won't and you will have phone calls only.
I'm sure you would have noticed, but my phone always asks me if it OK to connect to the radio, and unless you acknowledge, it doesn't connect. So make sure you respond to all prompts on the phone.