Hi, Im from Viet Nam, my redmi note 4 has problem with stanby battery, it drains so fast, maybe 15-16% in 6h, I found that my rmn4 has problem wih phone signal, if i turn on airplane mode, it doesn't drain that, other user in VN have the same problem too, can anyone helps me fix that? Thank you so much, sorry for my bad english
What about switching to 2g/3g only in mobile network settings? Do you have 4G where you live? My network provider doesn't offer 4G at the moment and so it's the first thing I switch off when I get a new phone as there's no point having the mobile radio searching for a 4G connection when there isn't one available.
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Redmi Note 4 has a software bug which prevents CPU going to deep sleep. This is easily observed via CPU Spy or some other similar tool.
There are couple of ways to solve it, but the easiest one is just to swap your SIM card to one that supports LTE (4G). You don't have to use 4G networks, you just need new SIM card and CPU will go to deep sleep.
If this is not option for you, this is permanent solution (requires root):
http: // en .miui. com/thread-386101-1-1.html
Also there is temporary fix (which works until phone is restarted), but I just can't find it anymore
Try googling turn on "lte ram dump deep sleep" or something like that. There is step-by-step manual how to enable deep sleep from hidden service menu.
Thanks, I was looking at the root option and the fix you can flash in twrp. I have a 4G sim (I think), my network is an mvno and only launched 4g a couple of weeks back. My sim is a new one I got back July but I wonder if it would be worth requesting a replacement that now might actually be 4g capable. I don't have a 4g data plan and won't be adding one for a while but maybe just having a new 4g sim would help.
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