According to various embodiments, a user can receive voice calls using multiple phone numbers on a mobile device such as a smartphone. The voice calls can be carried via the wireless carrier associated with the mobile device, using the device's normal allowance for voice calls, without the need to use large amounts of data. In at least one embodiment, incoming voice calls are accurately identified as having been made to either the registered number for the device or an alternate number. In addition, in at least one embodiment, when a voice call is received at a device, the phone number, name, and/or other contact information for the originator of the call is/are provided to the user of the device. In at least one embodiment, any or all of these pieces of information can be provided to the user of the device for every incoming voice call.