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It's not possible to add the applications on the exception list when it's turned off, but you probably mean that you turned it on, added them to the whitelist and then turned it off... Well, try turnin it on, then turn it off, and then shut down your phone and turn it on again. Test it and see if it's working okay by asking a friend to contact you on viber (don't open viber).
If it still doesn't work, then try a factory reset as a last resort...
Also make sure you're not using any software to do the RAM management and kill apps in the background. |
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