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I had a z3 compact before and it was fine in swimming pool and sea, so I figured z3+ would be too, but it has not cover on charger port
The phone is waterproof according to IP68 certification. See the next statement:
The Xperia Z3+ is waterproof and protected against dust, so don’t worry if you get caught in the rain or want to
wash off dirt under a tap, but remember: all ports and attached covers should be firmly closed.
You should not: put the device completely underwater; or expose it to seawater, salt water, chlorinated water or
liquids such as drinks. Abuse and improper use of device will invalidate warranty. The device has Ingress
Protection rating . For more info see www.sonymobile.com/waterproof. Note the Xperia has a capless USB port
to connect and charge. The USB port needs to be completely dry before charging.