* Message and Data Rates May Apply. No more than 30 messages (emergency alerts) a month will be sent to subscribers. Subscription to the AlertU keyword does not expire. To unsubscribe, text STOP or UNSUB to 253788 (ALERTU). For support, text HELP to 253788 (ALERTU) or email support@alertu.org. Supported Carriers for the AlertU service are: AT&T, Alltel, Boost, CellularOne, NEXTEL, Sprint, T-Mobile, U.S. Cellular and Verizon Wireless. Campaign / service is compatible with most handsets. Participation must be made by the account holder.