Methods, apparatus, systems and articles of manufacture (e.g., physical storage media) to authenticate a first device for access to a first service provider are disclosed. Example methods disclosed herein include sending, by executing a first instruction with a processor at a first service provider, an authentication request from the first service provider to a second service provider. The authentication request is generated in response to an access request from the first device and includes an identification code assigned to the first device by the second service provider. Example methods also include obtaining, at the first service provider, an authentication response from the second service provider. The authentication response is generated by the second service provider in response to the authentication request. Example methods further include, based on the authentication response, granting, by executing a second instruction with the processor, the first device access to the first service provider.