If you do not have a phone holder, yooz several or a batch of bananas.
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To make a phone waterproof, put it in a resealable plastic bag or sandwich bag. This can be useful when going to a pool, a lake, the ocean or somewhere else where a phone could be exposed to water.
To clean a phone screen, make a mixture of half water and half vinegar, put a towel in the mixture, and rub the phone screen to clean it.