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I press the 'dont ask me again' accidentally when I disconnect my charger, how can I reactive the warning? If I want it to show back again
Thanks 
Try settings-apps-all-smart connect,clear data.
I tried before, but now it is the second time I press the 'dont not ask me again' button, and then I try the way you said, but it doesn't work
Does it still have any alternative way? 
Try settings-apps-all,scroll down for settings app and clear data.
Go to Settings>Personalisation>Manage Notifications then look for the unchecked box...
Please also be aware that this warning is not tied to any sensor regarding the tabs, it just activates as a reminder when you connect a charger etc.
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@XperianceZ1 wrote:
Go to Settings>Personalisation>Manage Notifications then look for the unchecked box...
This does not work,I have checked it before.As Sam says,the notification is not related to a sensor,but we cannot find which app is related to waterproof warning and to mobile data.
Thanks, but it doesn't work too...
The warning still did not pop out, when I disconnect with my charger.
Is it still got any suggestion? 
Try xperia care:
http://www.sonymobile.com/global-en/support/contact-us/
If you get a helpful answer,share it with us.
Here is the only way to reactive the water proof warning is to reset my phone
Settings > Backup & reset > Factory data reset 