Mobile Share, Mobile Share Value, Mobile Share Advantage, Mobile Share Flex, and former AT&T Unlimited plans: Unlimited text: Standard messaging: For phones only. Requires compatible device. Includes unlimited number of messages up to 1MB in size within and from the United States (the Domestic Coverage Area or DCA) (and for select plans within Mexico) to more than 190 countries for text messages and 120 countries for picture and video messages. We may add, change, and remove included countries at our discretion without notice. Messages sent through applications may incur data or other charges. Get details at att.com/text2world. Advanced messaging: For customers with advanced-messaging-capable devices only. Both sender and recipient(s) must be AT&T postpaid wireless customers with HD Voice accounts, and both must have their devices turned on and be within the AT&T-owned-and-operated DCA only (third-party coverage and use in Mexico are excluded). Includes unlimited number of messages up to 10MB in size. Additional restrictions apply and can be found at att.com/advancedmessaging.