Using an NSA backdoored RNG is pretty redundant. A cell phone cannot be secured against NSA. They'll just activate their keylogger and grab the plaintext before it has even been encrypted.
More simply: right now, the NSA is vacuuming up everyone's data across all services. Your emails, your texts, your search history, certainly your metadata; basically everything. And the only reason it was possible for the NSA to do this to us is because security has historically been an afterthought.
TextSecure is the first step toward keeping our data free from prying eyes. It prevents the NSA from having default access to our texts. If the NSA wants your data, they'll have to deliver a keylogger to your specific phone in particular. That's very different from gathering everyone's comms all the time.
Telegram, on the other hand, offers no protection whatsoever against the NSA vacuuming up everything, because the NSA can simply MITM every Telegram conversation as they're initiated, just like the NSA MITM's CAs to decrypt your https traffic.
In summary: if you care at all about a world in which the NSA can't sift through all of your data, then use and promote TextSecure, because TextSecure offers protection against governments.
Now, I've said "NSA" about ten times here, but this is true for other governments too. Other governments have impersonated CAs, coerced CAs into issuing bogus security certificates, etc, to target people they deem to be political radicals. China tries very hard to do this. I'm sure there are plenty of governments worldwide who are all working on doing exactly this.
So it's not just the NSA. It's the entire future landscape of our data privacy. If you believe you have the right to electronic privacy, then use TextSecure, and make sure everyone knows the truth: Telegram offers no such privacy.
http://www.osnews.com/story/27416/The_second_operating_syste...
"What makes it even worse, is that every baseband processor inherently trusts whatever data it receives from a base station (e.g. in a cell tower). Nothing is checked, everything is automatically trusted. Lastly, the baseband processor is usually the master processor, whereas the application processor (which runs the mobile operating system) is the slave. So, we have a complete operating system, running on an ARM processor, without any exploit mitigation (or only very little of it), which automatically trusts every instruction, piece of code, or data it receives from the base station you're connected to. What could possibly go wrong? "
http://www.thinksmallcell.com/Technology/build-your-own-open...
So anyone with a little time on their hands can be that "trusted party" for everyone in radio vicinity.
you have won the prize! expecting anything to be secure on a mobile device is a serious mistake.
in some ways, textsecure and redphone actually induce behavior that puts people at risk: no amount of encryption can make a mobile device safe.
the only possible exception to this is a device that is built from zero and has fully in-house gsm stack, etc.