Not a great solution for preventing water damaged phones....

I don't think all mobile phone owners are going to start carrying their phone around in a sealed plastic bag to avoid water damage!

http://www.huffingtonpost.co.uk/2016/01/07/how-to-waterproof-your-mobile-phone-for-free_n_8928732.html
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If you do drop your phone in liquid then we can help - contact us at www.phonedatarecovery.co.uk