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Recently the following picture has been circulating on some websites on the internet:

enter image description here

I highly suspect this is some kind of a fake. Is there any data on maximum operating temperature for a mobile phone versus the temperature inside a cake being baked? I know that many phones are waterproof so possibly immersion in cake batter would be survivable, but is baking?

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    The temperature inside a baking cake isn't as high as you may think, probably not over the boiling point of water. Remember that it probably (depending on your recipe) has water or other liquid in it, and a good cake should come out moist. You could maybe ask for specifics on the cooking site... – jamesqf Mar 11 '16 at 4:37
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    Also, if you don't intend to cook the cake evenly, you can just cook it at higher temperature for less time. If you can bake ice cream, you can bake a phone. – richardb Mar 11 '16 at 8:59
  • @jamesqf “over the boiling point” does not negate the cake coming out moist. The water vapour can be trapped inside the dough, after all (and it is; at least for a time). – Konrad Rudolph Mar 11 '16 at 22:16
  • What do you mean by "intact"? Do you mean "functional"? – sumelic Mar 11 '16 at 22:58
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It's possible, but unlikely.

It's possible

Cakes cook from the outside in. If you are not careful you might pull out a cake cooked outside but raw inside. This happens when the oven is too hot.

What to do if my cake seems ready from the outside (it's brown as it should be) however it's not done yet inside? [...]

If you find that your cakes are brown on the outside but are still raw on the inside then it is likely that the oven is too hot.

ASkNigella.com - Baking a cake

In fact, there are cakes which are cooked that way on purpose, for example the chocolate lava cake

Furthermore, even in the case of full cooking, internal temperature rise to less than 100°C, which are high, but not massively outside the phone's operating range.

I've never seen any recipe that looks for an internal temperature of over 200F (93C). Bread is generally "done" at 190F (88C). At temperatures at or above the boiling point of water, you're getting into candy making territory

What is the maximum internal temperature of baked goods?

One should store an iPhone between -20°C to 45°C. This is what recommended by Apple and what presumably guarantees minimal to no chance of breaking. It's not unconceivable that phone might survive to temperatures of twice that range.

Store the device where the temperature is between -20º and 45º C (-4º to 113º F).

Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures

In fact, the phone in the picture shows the correct screen that should appear when an iPhone has overheated (same source as above):

cool down dude

It's unlikely

While it is possible, it's unlikely because checking whether a cake is cooked is very easy and therefore is commonly suggested. The technique is inserting a toothpick and checking whether it gets wet or dirty. This would have revealed the phone, of course.

[...] How do i really know that my cake is done?

[...] You can also check the cake by inserting a thin skewer, cake tester or cocktail stick (toothpick) into the centre of the cake. If the cake is fully cooked then the skewer will come out clean, if there is raw or partially cooked batter clinging to the skewer then return the cake to the oven for a further 5 minutes and test again. For rich fruit cakes the skewer test is the best way of checking that the cake is cooked all the way through.

ASkNigella.com - Baking a cake

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    This requires a lot of guesswork. I think there's only way to know for sure. – PointlessSpike Mar 11 '16 at 10:55
  • It should be noted that the temperature specs for the iPhone is narrow. Also digitaltrends.com/android/… may be of interest. – liftarn Mar 11 '16 at 11:28
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    I'm not sure if it is that unlikely to not find a phone while checking if the cake is done. If you have a rather wide cake or tall cake, a phone could go unnoticed. – T. Sar Mar 11 '16 at 12:04
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    "This would have revealed the phone, of course." -- I've never inserted a toothpick far enough into a cake to detect a phone that has sunk to the bottom. – Jim Balter Mar 12 '16 at 10:06
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    @JimBalter I was thinking of the "Imagine this scenario" text as just imagination, but yes the imagined scenario is different from what happens in the video that the pictures are from. – DavePhD Mar 12 '16 at 13:26
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The pictures are not fake. They are real photos of a phone baked into a cake, and then removed. However, the "Imagine this scenario. You drop your phone..." text is just imagination, not what actually occurred in making the photos.

The photos are frames from the video iPhone 5S Baked In Cake - Will it Survive?. In the video, the narrator, TechRax, deliberately puts the phone into the batter and cooks it. Afterwards, he shows that it still starts up, and displays the high temperature warning on the screen, but the video ends without demonstrating that the phone is fully functional.

The version in the OP was created from the video in several stages. The text was added here: http://fini-mun.tumblr.com/post/93694596620/imagine-this-scenario-you-drop-your-phone-in-the to an earlier twitter version of the pair of photos with even more misleading text.

In a similar video, iPhone 6S Boiling Hot Water Test! Will it Survive?, the phone is functional after a first round of boiling, and has at least limited functionality after a second round of boiling.

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