Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for facilitating and improving push messaging provided to users. In one aspect, a method includes receiving, from a user device, a request to subscribe to a push messaging service, selecting a given phone number that is uniquely associated with the user based on the received request, transmitting, to a user device, a first message that presents visual information at the user device and includes the given phone number, receiving, by the one or more servers, a second message addressed to the given phone number, selecting an additional message that presents additional visual information at the user device based, at least in part, on the message received from the user device and one or more of a geolocation of the mobile device or a time of day, and transmitting the additional message to the user device.