How to zoom in on a photo without it getting blury?

Today i took a pic with my friend we were in school and in the backround there's this guy making a face he goes to my school and when i zoom in it gets a lil blury and hard to see but the pic itself looks very clear. (It's on my Iphone 3) so if you know any aps or anything i can do to zoom in and find out please tell me.

You are asking for movie magic miracles - so far, we have no magic wand for things like that.

You are using a TELEPHONE to do a camera's job, and you simply can't expect the same quality and resolution that a good camera/lens would give you.

Get a better camera.

That is the secret, you need to take your pictures with a higher resolution.

You are trying to enlarge a photo beyond the capabilities of the native image.

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