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This security-focused messaging app allows you to register a unique username so that people can message or add you to groups without necessarily knowing your phone number. This way, you can keep your number private. Telegram Options Set custom notification sound

Telegram gives you an option where you can select who can see your last seen time. To configure this, go to “Settings”, “Privacy and Security” and then tap on “Last Seen & Online”. You can share it with everybody, or people in your contact list, or nobody, or add exceptions like “never share with” XYZ. If you want to add a second number instead of migrating, Telegram also lets you use multiple accounts at once. For Android, on the left sidebar, tap your contact info to expand the account switcher and choose Add Account. On iPhone, tap Edit on the profile page and choose Add Another Account. Telegram offers you to create and use your own custom theme with whatever colors you want. Also, it offers many ways to customize it the way you want it to. There is nothing to pay for anything. Everything is FREE and you can create your own personalized theme with your favorite colors. Telegram is kind of a big deal for me.

Unlike other cloud-based solutions, Telegram’s personal space has infinite storage. You can also send all kinds of files here. However, note that each file you send must be sized lesser than 1.5GB. Color-theme of the app Keep Alive Join Requests for Public Groups

Because Telegram lets you interact with people even if you aren't in each other's contacts, you may wish to make your account more private. To change privacy options, head to Settings > Privacy and Security. Here, you can change who can see your phone number, active status, and more. If you don’t want messages in your secret chats to hang around forever, Telegram lets you set self-destruct timers to permanently remove them. After a message is received, it remains in the chat for a predetermined period — you can choose times between one second and one week – before disappearing.