My sister has an iPhone 4 and there is no update button in the settings.

Answer

jimlynch
Vote Up (18)

Did she connect it to iTunes? Also, iOS usually notifies you when there is an update available.

Here's a helpful article:

iOS: How to update your iPhone, iPad, or iPod touch
http://support.apple.com/kb/HT4623?viewlocale=en_US&locale=en_US

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