My iPhone isn't working on iTunes?

I have re-installed iTunes just today but it says that my iPhone can't be used because the iTunes version is too old. I HAVE INSTALLED IT TODAY HOW IS IT OLD
I have no music on my phone and I don't know what to do

What operating system does your computer have?

Do what it says and download the latest version. It's always possible they released the latest version today. It's also possible that the version you installed is old.

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