20. The system of claim 18 , wherein the instructions further cause the processor to: authenticate the text message when the phone number for the user is associated with the first user-specific system number.
18. A system comprising: a text messaging hub comprising a processor and a memory that stores instructions that when executed cause the processor to: receive a sign-up request, the sign-up request including a user number for a user, the user number for the user including a phone number for the user; responsive to receiving the sign-up request; assign a first user-specific system number to which a mobile device is to direct future text messages, the mobile device being associated with the phone number for the user, wherein assigning the first user-specific system number comprises storing the first user-specific system number and the phone number for the user to a set of authorized user number and specific number pairs, the first user-specific system number being different from the phone number for the user; and send an initiation message to the mobile device associated with the phone number for the user, the initiation messaging including the first user-specific system number; receive a text message from a device, the text message being directed to a specific number associated with the text messaging hub, wherein the specific number is one of the plurality of possible numbers associated with the text messaging hub, the text message including the phone number for the user; determine whether the text message is authentic based on whether the phone number for the user is associated with the specific number based on the set of authorized user number and specific number pairs, wherein the phone number for the user is not associated with the specific number when the specific number to which the message is directed is not the first user-specific system number, determine that the text message is not authentic in response to determining the phone number for the user is not associated with the specific number; and responsive to determining that the text message is not authentic: assign a second user-specific system number to which the mobile device is to direct future text messages; and send, to the mobile device at the phone number for the user, a notification text message that includes the second user-specific system number.