Really? I thought all types of accounts (Public, User, Security, and Admin) required a subscription but only User, Security, and Admin required authorization. If not, then how do people hack remotely via VR?
From SR4A, page. 224, Subscriptions
To connect to a node (aside from the one on which your persona is running ), you must subscribe to it. A subscription is a two-way communications link through the Matrix. This is a steady link that can be maintained for extended periods of time. You must subscribe to a node if you want to “travel” to it in the Matrix, which means that you must be able to either connect with it directly (with a wired connection, or when within mutual Signal range) or by establishing a route through the Matrix network. Subscribing to a node is a Complex Action ( Log On, p. 231). When you log on to a node, your icon appears there.
SR4A, page. 225, Access Accounts
When you log on to a node, you do so at a certain access level, which is defined by your account. There are four types of accounts, public, user, security, and admin, in order of least to most access. Except for public accounts, access to an account level requires authorization, which is described in the next section, Authorization and Authentication. A public account is a sort of “foyer” for a node. When logging on without any authentication, you get a public account. Public accounts usually allow the user to access public information about the node, and could also allow a small amount of functionality, like the ability to order food, shop, fill out forms, etc., depending on the node’s purpose. Most retail outlets, malls, restaurants, and other nodes open to the public offer this account to customers.
Unwired, page. 55, Actions Needing Subscriptions
Accessing a node
All emphases are my own. From that, it seems that all public accounts require a subscription too. Though I could be wrong, I'm still learning (even though I've been playing for about a year

)