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AlertU is supported by all major carriers: Alltel, AT&T, Boost Mobile, Cellular One, Nextel, Sprint, T-Mobile, US Cellular, and Verizon. Small regional carriers, pre-paid phones and mobile virtual network operators (MVNOs) often do not support short code access.
If your carrier is not currently supported, please e-mail us at firstname.lastname@example.org as new carrier support is constantly being added to the AlertU platform.