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Depends on who your adversary is and how much you trust their protocol (some weird homegrown thing with clever/questionable cryptographic choices, the last time I checked) and implementation. Your texts don't generally run through Telegram's infrastructure, for example.

Too bad I can't send a secure text from my Telegram desktop client. Lucky for me, there's Signal.

Only 1-1 calls are encrypted, voice chats (group calls) are not