Location identifiers in mobile messaging

A computer-implemented method comprising:

• receiving, by an Internet Protocol Multimedia Subsystem (IMS) node from a communication device via an untrusted non-3GPP radio access network, a message that indicates, in a private header of the message:
• a location identifier (ID),
• a first timestamp indicating a time when the location ID was obtained by the communication device, and
• a second timestamp indicating a time when the message was transmitted by the communication device;
• and
• in response to receiving the message, generating, by the IMS node, an estimate of a current location of the communication device by generating a shape surrounding a point location specified by the location ID, the shape having a size determined based on a difference between the first timestamp and the second timestamp.

One or more non-transitory computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising:

• receiving, from a communication device via an untrusted non-3GPP radio access network, a message that indicates, in a private header of the message:
• a location identifier (ID),
• a first timestamp indicating a time when the location ID was obtained by the communication device, and
• a second timestamp indicating a time when the message was transmitted by the communication device;
• and
• in response to receiving the message, generating an estimate of a current location of the communication device by generating a shape surrounding a point location specified by the location ID, the shape having a size determined based on a difference between the first timestamp and a second timestamp.