Thought I remembered this thread ongoing....I'm bored / frustrated with my Galaxy S4 and thinking of jumping to BB as I've had it before and enjoyed it (back to the Curve days) and thought about trying out the Z10/Z30 as they seem to be getting good reviews.
Any recommendations? Not a heavy app user but just want phone to work with emails/calls/browsing etc. S4 seems to be getting more and more buggy. Ideally would want unlocked even trade with my phone so net $0 in the transaction.
The Z30 would be the way to go. Compare to the Z10, it has a larger screen, bigger battery, more RAM, etc.
2 years ago bought my wife's Z30 for $400, factory unlocked, world edition (pentaband phone).
These phones are great for emails, messaging, phone calls, browsing etc. This is not a good choice for snapchat, instagram, clans games, or anything that heavily requires Google Play services. This might change in the near future.
Anywhoo, you should be able to score a Z30 for a couple hundred bucks in new/near new condition. you're better selling your phone separately as you'll get more $$ for it.
It's not for everyone and this isn't the same OS as you've used on the Curve. It's a good device for getting things done, but it's boring if you're looking for a time waster/filler (games, social stuff). It does have integration and support for your facebook/twitter/foursquare etc. It will run MOST android apps out of the box (netflix, skype, etc).
There are expectations of new device releases in the coming months and that might cause some sales for the older stuff. The Z30 is a couple years old now, so most of the kinks have been worked out and it has the specs to still receive OS updates. Best part for travelling, just pop in a SIM card from anywhere and it works out of the gate. Expandable storage supports up to a 64GB microSD officially and I've had a 128GB card work (however it does take a while to search things so I wouldn't go past 64GB).
The camera's are decent and functional. Samsung and Apple have better camera's. It does the job.