Can the iPhone 4 get ios 7?

Yes.

http://ipod.about.com/od/iphonesoftwareterms/f/What-Devices-Are-Ios-7-Compatible .htm

bigfoot97 wrote:

Can the iPhone 4, not the 4s, get the new ios 7 update?

Yes. > How to update your iPhone, iPad, or iPod touch

Whether you choose to use OTA = over the air or iTunes on your computer...

Be sure to Back Up first.

It is always prudent and recommended to Backup before any major Update / Upgrade.

How to BackUp

http://support.apple.com/kb/ht1766

What gets Backed Up

iTunes http://support.apple.com/kb/ht4946

iCloud http://support.apple.com/kb/PH2584

Yes.

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