AlertNow supports the following major carriers: Alltel, AT&T Wireless, Boost Mobile, Cellular One, Cingular, Nextel, Sprint, T-Mobile, US Cellular and Verizon.
SMS messages may result in a text messaging fee from your cell phone carrier. Each contact must "Opt-In" to receive emergency text messages.
HOW TO OPT-IN
Go to https://www.alertnowsms.com and enter the following pin in the Six-Digit PIN box on the right side of the screen:
TextMe
After entering the pin, the Opt-In and Opt-Out boxes are activated.
Click the Opt-In button and complete the information requested.
If at any time you would like to discontinue SMS service, go to the same website, enter the pin and select Opt-Out.