How to Find the SMS Gateway for a User

Note: Many mobile carriers and email service providers have discontinued commercial support for Email to SMS Gateways. As a result, sending notifications via SMS Gateway may not work as expected. Consider using OnTime's Priority SMS Service instead.
An SMS gateway is a service provided by cellular carriers. This service makes it possible to send a text message as an email to a mobile device. The cellular carrier dictates the exact format of the email address but is typically comprised of the mobile device's phone number, followed by the domain of the mobile service provider. For example, the SMS gateway domain for AT&T is "txt.att.net", making the driver’s full SMS gateway address something like this:
5415551234@txt.att.net
An SMS gateway can be assigned to each driver within their user profile within OnTime Management Suite. If known, enter the user's SMS gateway address in the SMS gateway field. Or click the ellipsis in the SMS gateway field to open a window that will form the gateway address by entering a Phone number and selecting the Mobile carrier.
For example, the following image shows a user with the phone number "541-555-1234" on the AT&T network.
You can find a comprehensive list of carriers and their SMS gateway addresses at these sites:
If you have trouble locating the correct address, contact the driver's mobile service provider for assistance.