Yes, you can use OnStar without a subscription. With the new AtYourService platform, OnStar subscribers will be able to access many services and products from popular merchants right from their vehicle’s dashboard. This includes discounts on dining out, hotel stays, shopping deals and more - all without having to pay for an expensive monthly subscription plan. Non-subscribers are also able to take advantage of this service by using the mobile app or website which allows them to manage their account information and access discounts as well. Additionally, non-subscribers still have the option of getting roadside assistance with no need for a monthly fee – though it may cost extra fees depending on what type of help is needed. Non-subscribers may also be eligible for some special offers such as free Wi-Fi in certain areas or discounted gas prices at specific locations. All in all, OnStar provides plenty of options for users no matter if they subscribe or not!