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Re:TDLib – Build Your Own Telegram Client by bqe on Thursday February 01, 2018 @04:39PM (#16286183)
You can easily use a VoIP number to set up Signal if that's really an issue for you.

The alternative (using Telegram's homegrown and dubious cryptography and lack of actually encrypted group messages) is significantly worse. Here's a nice summary of the issues: https://security.stackexchange.com/a/49802/43733

Re:TDLib – Build Your Own Telegram Client by ShabbosGoy on Thursday February 01, 2018 @06:59PM (#16287116)
VoIP is easily traceable too. Pay with a credit card for the number? Use Google Voice? Bam, they’ve got you.
Re:TDLib – Build Your Own Telegram Client by codedokode on Thursday February 01, 2018 @06:42PM (#16287024)
Telegram also requires a phone number so it is not any better than Signal. Regarding cryptography, anything is good as long as three-letter agencies cannot break it.