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It seems that they detected the bug and with a security update the polling was modified. It decreased the usage but it is still quite high (10-15% of battery use).
No. You can only do what you describe on Samsung devices with their "KNOX" feature. This uses special security hardware to provide separate, isolated environments on your phone, so there's no way that information can leak from the "business" environment to the "personal" environment. It's present on their high-end phones since the Galaxy S3, and you can ...
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