New answers tagged 4g
There's an app called "Super Download" that seems to be what you're looking for. From the XDA page: DESCRIPTION: Download web files much faster by using wifi and mobile data at the same time! Share or open a link from any program, like the web browser, and download it at speeds up to two times faster than usual. This is the only tool that can ...
If wifi connection is not very strong like musicwithoutpaper said it consumes more battery and it may save little battery to switch to 4G when idle. I would suggest to make little experiments and then choose optimal way to go.
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