How to stop fallback from H+ to 3G data Is it possible, and if so how, to lock the phone to using H+ for data and not dropping back to 3G? I suspect it isn't (firmware of the radio hardware I'm guessing) but there's times where I would be willing to take the battery hit to keep my data on H+ (specific application with data demands that doesn't like dropping back and forwards to 3G).

I'm not talking about changes in signal quality: I can be sitting in a single location, not moving, where both H+ and 3G are available. When data is being requested the phone typically goes to H+ as it is faster. Once the data demands reduce it drops back to 3G. I have read in a number of other places that this is on purpose to save battery. However my issue is that one app I use doesn't handle the transitions well so I'd like to stop the auto-fallback.

Android 4.2.2 on Samsung Galaxy S4 mini, Australian networks.
The best thing to do and it worked for me is download the HSPA+ Tweaker from google play store.

I dont know for sure but i think it works by sending extra data packages to trick the provider into thinking you are in need of a higher and faster connection, thus making your phone stay on H+ rather than dropping down to 3g or less.

I had the exact same problem and it is now sorted with this app.

It may use extra data but it is worth it when you need a quick boost, if you have unlimited data allowance you are laughing really.

you can switch the app off within a swipe and a tap so it really is an all round handy app.