But if I'm not chasing the latest OS or the latest phone then I'm quite happy on the old software. As for known insecurities, I think this is rather overplayed by the software companies eager for you to update. I can't recall too many serious breaches (happy to be corrected) and there must be...
I agree with Voroshilov. I owned an iPhone up to 4 and then switched to a Sony SP Android. It's extremely liberating, not feeling like you're chasing the latest technology and the iPhone really, really started to annoy me with battery life, the updates, the all-round experience actually.