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2. Comparison of cross-platform instant messaging clients

   en.wikipedia.org/wiki/Comparison_of_cross...

   A valid phone number or email address is not required for registration & login. However, the mobile app serves as the primary device, due to the end-to-end encryption architecture. [120] Yes No No No Trillian: No Yes No No Yes Viber: Phone number No No No No WeChat: Phone number or QQ number No No No No No WhatsApp: Phone number No Yes No No No ...

3. Telegram (software) - Wikipedia

   en.wikipedia.org/wiki/Telegram_(software)

   To start using Telegram, a user must sign-up with their phone number or an anonymous +888 number purchased from the Fragment blockchain platform. [58] [59] Changing the phone number in the app will automatically reassign the user's account to that number without the need to export data or notify their contacts.

4. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   Upon installation, it creates a user account using the user's phone number as the username (Jabber ID: [phone number]@s.whatsapp.net). WhatsApp software automatically compares all the phone numbers from the device's address book with its central database of WhatsApp users to automatically add contacts to the user's WhatsApp contact list.

5. Reception and criticism of WhatsApp security and privacy ...

   en.wikipedia.org/wiki/Reception_and_criticism_of...

   The report found that it would be therefore possible to add arbitrary phone numbers to a group chat such that future communication becomes insecure. [69] In October 2017, the German software company Open-Xchange criticized WhatsApp, among others, for using proprietary software and stated plans to create an open-source alternative. [70]

6. AOL Mail

   mail.aol.com

   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

7. Add, replace or remove AOL account recovery info

   help.aol.com/articles/add-or-update-aol-account...

   Sign in to the AOL Account Security page. Scroll to the bottom of the page. First add a new email or phone number. Enter your new recovery info and follow the on-screen prompts. Click remove next to the old recovery option. Click Remove email or Remove phone to confirm.