If I replace my iPhone screen, will I lose everything?

Hi! This weekend I'm getting my front screen on my iPhone fixed. In order for them to fix my screen, they'll have to take my phone apart. Once they put it back together, will everything (my data & pictures & everything else like that) still be there or will I lose it? Please answer my question!

No everything will still be there

Simple answer: No. You won't lose anything.
Detailed Answer: It is POSSIBLE that you could lose everything. Replacing an Apple Screen is very difficult. One slight of hand error and your phone could very well be an expensive mirror. Make sure the company (or you) does it carefully. Read reviews on the company and make sure they really know what they're doing.

It won't, don't worry, things are not in the screen

As a side issue, you should really back up your phone regularly, either using a Cloud based backup (iCloud or Dropbox for example) or by connecting it to iTunes on a Mac or a PC.
You get 5Gigabites of space on ICloud automatically anyway, so it would be silly not to use it.

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