Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: how do I subscribe to XM , streaming music is eating up my data on iphone
Document: It's just a wire , but I get better reception then my care. I can hear my music at full throttle.
I got this on my boat to upgrade from the factory one and could not be happier. The deck puts out great sound and the features are sweet. I can't begin to describe my life on the boat before having a deck that charges my iphone, it so sooooo nice to have that feature. You can also stream via bluetooth if you want too. All around, great purchase!
This unit is installed in a 25' Parker Pilothouse, so unit is out of the weather, in an enclosed cabin. For the first 2 months, this unit worked great. Then last weekend, I had issues getting the unit to power on. After disconnecting all the power, and re connecting, I was able to get it to power up, but only the volume knob would work. couldn't change channels, sources or anything. Plugged in USB, and was able to listen to music for a few hours.
Easy to install and looks great on the boat. Fits a standard space for a head unit perfectly. Bluetooth lets me play my music from my phone but control it from the receiver, so I don't have to worry about getting my phone wet or dropping it in the water. It's also very easy to switch to a different phone so other people can play their music if they want. Seems to be good quality and still looks brand new after a summer of use.
My marine mechanic recommends Clarion receivers above all over brands. However, I read the reviews about the bluetooth pairing issues but decided to buy it anyway. With any iPhone, we need to delete the clarion device from iPhone bluetooth list and re-pair it. Not a big deal, but slightly annoying.UPDATE: this product was installed inside the center console of a Boston Whaler that is very dry. We had a Clarion receiver previously installed in the same exact location for 11 years and it never had any issues.
Sound is incredible, works flawless with IPhone, installed in our Mastercraft, connects with iPad instantly!
Easy Install. Sounds Great. Bluetooth, Sirius/XM and Pandora all in one! Plus you can even play a CD if you want. A+
First the BlueTooth stopped working, then the XM Radio stopped working, then it went dead completely. Worst part is is Clarion has virtually no support and getting warranty repair/replacement is more of a hassle than it's worth. Clarion is still in the dark ages with customer service. Several others on my dock have the same M303 unit and have experienced the same so I'm not alone.
Really happy with my purchase , it's exactly what I wanted a marine stereo to be , already told my friends to have a look online
Great reciever, but have to repair the Bluetooth every time. It won't just connect, I have to forget it then repair the reciever to get it to connect. Otherwise this reciever works awesome.
Answer: Get the id number on the radio and call xm with it.  The will turn it on for you.