10. A method comprising: receiving, by a text messaging hub executing at a server device, 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: assigning, by the text messaging hub, 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 sending, by the text messaging hub to the mobile device associated with the phone number for the user, an initiation message, the initiation messaging including the first user-specific system number; receiving, by the text messaging hub, 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; determining, by the text messaging hub, 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; determining, by the text messaging hub, 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: assigning, by the text messaging hub, a second user-specific number to which the mobile device is to direct future text messages; and sending, by the text messaging hub, to the mobile device at the phone number for the user, a notification text message that includes the second user-specific number.
10. A method comprising: receiving, by a text messaging hub executing at a server device, 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: assigning, by the text messaging hub, 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 sending, by the text messaging hub to the mobile device associated with the phone number for the user, an initiation message, the initiation messaging including the first user-specific system number; receiving, by the text messaging hub, 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; determining, by the text messaging hub, 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; determining, by the text messaging hub, 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: assigning, by the text messaging hub, a second user-specific number to which the mobile device is to direct future text messages; and sending, by the text messaging hub, to the mobile device at the phone number for the user, a notification text message that includes the second user-specific number. 14. The method of claim 10 , further comprising: in response to determining that the text message is not authentic, sending, to the device at the phone number for the user, by the text messaging hub executing at the server device, a notification indicating that a third party may be attempting to spoof an account of the device at the phone number for the user.