One of the objectives of this eWEA specification is to define a set of requirements for the behavior of the mobile devices whenever an eWEA alert message is received. This specification defines a common set of requirements for Global System for Mobile Communications (GSM)@ Universal Mobile Telecommunication System (UMTS)@ and Long-Term Evolution (LTE) based mobile devices. Implementation of the requirements contained within this specification is mobile device manufacturer dependent. The support of 5G and beyond is outside the scope of this specification. Even though the scope of eWEA includes paging systems@ the behavior of paging devices for eWEA alert messages is not contained within this specification. Purpose The purpose of this specification is to define the eWEA set of common requirements for GSM@ UMTS@ and LTE based mobile devices behavior whenever an eWEA alert message is received and processed. This eWEA mobile device behavior specification is based upon the WEA enhancements identified in the September 2016 FCC Report Order on WEA Enhancements@ FCC 16-127 [Ref 9]. Any assumptions@ requirements@ and principles from J-STD-100 Joint ATIS/TIA CMAS Mobile Device Behavior Specification and the associated J-STD-100 Supplements which are applicable to eWEA are included in this ATIS specification. A common set of eWEA requirements for the mobile device behavior will allow for a consistent user experience regardless of the associated wireless technology of the mobile device. Additionally@ this common set of eWEA requirements for the mobile device behavior will allow the various local@ state@ and Federal level government agencies to develop user eWEA educational information that is independent of the wireless technology.