Re: The new phones are simply too expensive for what they offer
On that basis, I paid £10 for a network locked Blackberry Classic on eBay a few months ago, put in a PAYG SIM, stuck FDroid and Aptoide on and did a bit of trial and error to find out which FOSS apps (and old versions of apps) run smoothly. It's fine for WhatsApp with fileshare patch and MagicEarth gets me around, the old Blackberry Apps mostly still work (aside from Travel), it's solid on voice calls and I suspect if I drop it, the floor tiles will break before the phone does.
Having too much time on my hands, I used this in conjunction with a 2011 Sony Xperia Ray running LegacyXperia/CM11 Kitkat since anything that'll run on BB10 will run on Android 4.3/4.4 to have a phone small enough to fit in my coin pocket.