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You can't change clumsy, but you can change your phone case. Here's what's worked for me.
1. LifeProof Fre
The toilet doesn't have to be your enemy. This case is completely waterproof. In fact, I used it to take pictures while snorkeling.
Once you buy it, you really won't EVER pry yourself away from your phone, because you can totally use it in the shower or tub too. The limit does not exist.
You can get the waterproof case for iPhone 6s here.
(Note: For some reason, the prices vary a few dollars based on color. Pink is the cheapest.)
I've heard great things about Otterbox, but I would say their waterproof cases are not their strong suit. It's possible that I didn't use mine 100% properly, but I don't think that's why water started leaking into my phone when I took it into the ocean. I bought mine on Groupon for the 5s and it came in legitimate packaging. I noticed the Otterbox site doesn't offer waterproof cases anymore, so it seems that they came to the same conclusion that I did.
If you're not really concerned about water, but have a tendency to drunkenly (I mean, clumsily) drop your phone down the stairs, onto concrete, or onto other non-friendly surfaces, this case will be your new pal. The brand claims their cases are unbreakable, but I watched some YouTube videos from real customers that prove it to be true. I have seen videos of people tossing it out of second story windows and running it over with their car. The case might have a minor scratch, but your precious baby (aka your iPhone) will be safe.
The Defender series is the most popular. The case is a bit clunky, but some people have shattered their screens far too many times to care. If you want something that's a bit slimmer, go for the Commuter case, but note that your screen is not protected with that one...so in that case, I would just suggest a silicone case with a screen protector (it's equally effective, but likely cheaper).
(Note: Prices vary here based on color as well.)
3. Silicone Case
These cases are usually super cheap and have ridiculous designs. My current phone is knockoff of the high-end Italian brand, Moschino, which also ripped off McDonald's (you can see what I mean here).
With the silicone cases, you have to make sure there's a "lip" wrapped around all 4 corners in the front. That way, if you drop your phone on your side, it's still protected. I have had 2 silicone cases for long-term use ever since 2012 and I've never had an issue.
Silicone cases are the most affordable option. You can see crazy designs like the one pictured above here. MiniInTheBox also has some really awesome silicone cases (with free shipping and OK quality), but the search feature isn't ideal, and shipping will take about a month.
4. Screen protector
This is probably even more important than protecting any other part of the phone. Unless you have an Otterbox or Lifeproof case that is wrapped around the phone 360 degrees, you NEED a screen protector.
I'm absolutely terrible at putting them on, but once my phone is turned on, I can't really tell the difference. There are so many different options for screen protectors, but I haven't really noticed much of a difference. I'm pretty sure I got a matte version. Just make sure the reviews are okay wherever you buy it -- I bought one for $0.99 plus free shipping from a retailer that ships from China, and it took a million years to receive and the cutouts were uneven.
The more you know.
You don't actually need anything from this site. You can go about your day without buying an avocado-shaped purse or Poke Ball mug. Go pay your rent.