So forcing 4g or 3g isn't really essential for saving battery? I was reading this was the reason people used the field test & it made no sense to me. Your reasoning I understand
Well, I have the same battery life with 3g/4g, with 2g my battery lasts a little longer, but in Mexico, the 2g connection (for internet purposes) it's almost zero, it even can't connect with WhatsApp so that's why I need the field test to force my connection to stay (at least) in 3g.
Scotty, it all depends on your coverage area... In those areas where there is a very spotty LTE deployment, the radio constantly drops in and out of LTE and spends a lot of effort trying to maintain an LTE lock if instructed to "use the fastest connection."
If you are in a 5x5 area, don't bother with the trick.