Get a Kindle Fire (wi-fi only, only when you want it), root it, and add only GPL software you trust, including a SIP client. Carry a Sprint wi-fi hotspot, turning it on only on your terms.
Do you have any information (maybe guides/howtos) on how to do this?
Eventually you'll find that "most people" are actually a lot more intelligent than you think they are, and they're laughing behind your back while you go on caring about inane shit that doesn't matter.
Where did I say anything about intelligence? I know many people who are intelligent, yet do not care about the world around them. I know many people who care deeply about the world around them, but are not intelligent. And I could really care less if some yahoo is laughing at me because he gets to play Angry Birds on his iPhone/Android Phone and I don't (not having one). I find enjoyment and fulfillment working (one very small step at a time) to make the world a better place.
Sure, not everyone enjoys the same stuff, and the enjoyment people get from sitting in front of the TV all evening is equivalent to the enjoyment I find in life. But I am saying that just because people don't care about FOSS doesn't mean proprietary software is acceptable/good/better, nor does it mean that the actions of Apple/Microsoft/Google/etc are acceptable either. The point is that "most people don't care about FOSS" is just a dumb argument.
Most people don't care about much at all. They seem to care when, for example, a televised address from the President prevents them from watching their favorite program on the idiot box. They seem to care when their local sports team is beaten by another sports team. But when they are told that the company that controls the software on their mobile phone (already they are nodding off...) is spying on them, recording their location, and selling their personal information to other companies for profit, do they care? No. They don't even seem to care when can only install programs on their phones that the OS-maker allows them to. (Of course they don't care, they can still install Angry Birds.) They especially don't care when their phone company turns over their private conversations to the police without even putting up a fight for the consumer. That would be because it isn't *their* private conversations, it's the private conversations of those angry hooligans marching in the streets asking for change.
Most people don't care about freedom in general unless it interferes with their daily pleasures/addictions, and cannot see the long-term consequences of the slow unraveling of their freedoms. The fact remains that proprietary software *is* an attack on our freedoms that we may well end up regretting some day. The fact remains that there *is* an alternative in FOSS. The fact remains that we still have enough freedoms to take a stand against the corporations and the corruption in government. And, in my opinion, those of us that understand these things should indeed take a stand, as RMS is doing.
Also, are cellular communications inherently less secure than wired communications like a land line? Or are those even easier for say your phone company or government to listen in on?