can i take my iphone 7 into the shower ?

While that article suggests it's more water resistant than some might think, the reality is if the OP takes his phone into the shower and water gets in rendering it useless, it won't be covered under warranty and will likely require replacing. It's just not worth the risk. Apple doesn't sell phones as waterproof, so user beware.

NO. It's not waterproof. It is water resistant. Big difference.

Here's a good article on the iPhone 7's water resistance

http://www.trustedreviews.com/news/is-the-iphone-7-waterproof-2940301