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  2. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.

  3. Cell Broadcast - Wikipedia

    en.wikipedia.org/wiki/Cell_Broadcast

    A Cell Broadcast message is an unconfirmed push service, meaning that the originators of the messages do not know who has received the message, allowing for services based on anonymity. [1] Cell Broadcast is compliant with the latest EU General Data Protection Regulation (GDPR) as mobile phone numbers are not required by CB. The originator ...

  4. Type Allocation Code - Wikipedia

    en.wikipedia.org/wiki/Type_Allocation_Code

    The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.

  5. Apple Push Notification service - Wikipedia

    en.wikipedia.org/.../Apple_Push_Notification_service

    The maximum notification payload size allowed using the HTTP/2 API is 4 kilobytes. [11] Apple shut down the legacy binary API at the end of March 2021. [12] The HTTP/2 provider for APNs uses TCP port 443 as the main port of communication, but developers are also allowed to use TCP port 2197 if outbound access to port 443 is blocked by firewalls ...

  6. Some iPhone users can send texts when service is down ... - AOL

    www.aol.com/iphone-users-send-texts-down...

    The iPhone 14, 15 and 16 models are all capable of connecting to satellites, but iOS 18 is required to send text messages, according to Apple. To make sure your phone is updated, go to Settings ...

  7. Access AOL Mail on mobile devices

    help.aol.com/articles/aol-mail-mobile-mail

    The AOL App gives you access to all the best of AOL, including Mail's innovative features and settings. With the app version of AOL Mail, you'll be able to add accounts, send mail, organize your mailbox, and more on either Android or iOS.

  8. Over-the-air update - Wikipedia

    en.wikipedia.org/wiki/Over-the-air_update

    The similar term over-the-air service provisioning (OTASP) specifically refers to the wireless initial provisioning ("activation") of a phone. During activation, a mobile phone is provisioned with parameters like its phone number, mobile identification number , and system ID , granting it initial access to the cellular network.

  9. Compose and send emails in AOL Mail

    help.aol.com/articles/aol-mail-compose-and-contacts

    1. From the inbox, click Compose. 2. In the "To" field, type the name or email address of your contact. 3. In the "Subject" field, type a brief summary of the email.