If you would like to be notified via text message, you can enter an email address as follows, depending on your cellular carrier.  For example, if your phone number is 402-123-4567 you would use:

Verizon: 4021234567 (at) vtext.com

Sprint: 4021234567 (at) messaging.sprintpcs.com

US Cellular: 4021234567 (at) email.uscc.net